# Glossary of engineering

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This **glossary of engineering terms** is a list of definitions about the major concepts of **engineering**. Please see the bottom of the page for glossaries of specific fields of engineering.

Engineering |
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## A

**Absolute electrode potential**- .
**Absolute motion**- .
**Absolute pressure**- Pressure measured in reference to a vacuum
**Absolute zero**- The coldest possible temperature, at which all molecular vibration stops; −273.15 °C (−459.67° Fahrenheit).
**Absorbance**- .
**AC power**- Electric power delivered by alternating current; common household power is AC.
**Acceleration**- The rate at which the velocity of a body changes with time, and the direction in which that change is acting.
**Acid**- .
**Acid-base reaction**- .
**Acid strength**- In strong acids, most of the molecules give up a hydrogen ion and become ionized.
**Acoustics**- The scientific study of sound.
**Activated sludge**- .
**Activated sludge model**- .
**Active transport**- Transportation of people by walking, cycling, or other human=-powered methods.
**Actuator**- The final element of a control loop, that translates control signals into a physical output movement.
**Adenosine triphosphate**- .
**Adhesion**- .
**Adiabatic process**- A process where no heat energy is lost to outside space.
**Adiabatic wall**- A barrier through which heat energy cannot pass.
**Aerobic digestion**- .
**Aerodynamics**- .
**Aerospace engineering**- .
**Afocal system**- .
**Agricultural engineering**- The profession of designing machinery, processes, and systems for use in agriculture.
**Albedo**- A measure of the fraction of light reflected from an astronomical body or other object.
**Alkane**- .
**Alkene**- .
**Alkyne**- .
**Alloy**- .
**Alpha particle**- .
**Alternating current**- Electrical current that regularly reverses direction.
**Alternative hypothesis**- .
**Ammeter**- An instrument that measures current.
**Amino acid**- .
**Amorphous solid**- .
**Ampere**- The SI unit of current flow, one coulomb per second.
**Amphoterism**- .
**Amplifier**- A device that replicates a signal with increased power.
**Amplitude**- .
**Anaerobic digestion**- .
**Angular acceleration**- .
**Angular momentum**- .
**Angular velocity**- .
**Anion**- .
**Annealing (metallurgy)**- A heat treatment process that relieves internal stresses.
**Annihilation**- .
**Anode**- The electrode at which current enters a device such as an electrochemical cell or vacuum tube.
**ANSI**- American National Standards Institute.
**Antigravity**- .
**Applied engineering**- .
**Applied mathematics**- Mathematics used for solutions of practical problems, as opposed to pure mathematics.
**Arc length**- .
**Archimedes' principle**- .
**Area moment of inertia**- .
**Arithmetic mean**- .
**Arithmetic sequence**- .
**Aromatic hydrocarbon**- .
**Arrhenius equation**- .
**Artificial intelligence**- The intelligence of machines and the branch of computer science that aims to create it..
**Assembly language**- A computer programming language where most statements correspond to one or a few machine op-codes.
**Atomic orbital**- .
**Atomic packing factor**- The percentage of the volume filled with atomic mass in a crystal formation.
**Audio frequency**- .
**Austenitization**- .
**Automation**- .
**Automaton**- An early self-operating robot, performing exactly the same actions, over and over..
**Autonomous vehicle**- A vehicle capable of driving from one point to another without input from a human operator.
**Azimuthal quantum number**- .

## B

**Barometer**- A device for measuring pressure.
**Battery**- Electrochemical cells that transform chemical energy into electricity..
**Base**- .
**Baud**- Rate at which data is transferred in symbols/second; a symbol may represent one or more bits.
**Beam**- A structural element whose length is significantly greater than its width or height.
**Beer–Lambert law**- .
**Belt**- A closed loop of flexible material used to transmit mechancial power from one pulley to another.
**Belt friction**- .
**Bending**- .
**Benefit–cost analysis**- .
**Bending moment**- The product of bending force and distance, measured in units of length * distance..
**Bernoulli differential equation**- .
**Bernoulli's equation**- An equation for relating several measurements within a fluid flow, such as velocity, pressure, and potential energy.
**Bernoulli's principle**- .
**Beta particle**- .
**Binomial random variable**- .
**Biocatalysis**- .
**Biomedical engineering**- .
**Biomimetic**- .
**Bionics**- The application of biological methods to engineering systems.
**Biophysics**- .
**Biot number**- .
**Block and tackle**- A system of pulleys and a rope threaded between them, used to lift or pull heavy loads.
**Body force**- .
**Boiler**- A device whose purpose is to add heat to a working fluid to vaporise it..
**Boiler (power generation)**- A boiler used in a power plant for electricity or propulsion.
**Boiling point**- The state at which a substance becomes gaseous.
**Boiling-point elevation**- .
**Boltzmann constant**- .
**Boson**- .
**Boyle's law**- .
**Bravais lattice**- .
**Brayton cycle**- A thermodynamic cycle model for an ideal heat engine, in which heat is added or removed at constant pressure; approximated by a gas turbine.
**Break-even analysis**- .
**Brewster's angle**- .
**Brittle**- .
**Bromide**- Any chemical substance made up of Bromine, along with other elements.
**Brønsted–Lowry acid–base theory**- .
**Brownian motion**- .
**Buckingham π theorem**- A method for determining ∏ groups, or dimensionless descriptors of physical phenomena.
**Buffer solution**- .
**Bulk modulus**- .
**Buoyancy**- A force caused by displacement in a fluid by an object of different density than the fluid.

## C

**Calculus**- The mathematics of change.
**Capacitance**- The ability of a body to store electrical charge.
**Capacitive reactance**- The impedance of a capacitor in an alternating current circuit, the opposition to current flow.
**Capacitor**- An electrical component that stores energy in an electric field.
**Capillarity**- .
**Carbonate**- Any mineral with bound carbon dioxide.
**Carnot cycle**- A hypothetical thermodynamic cycle for a heat engine; no thermodynamic cycle can be more efficient than a Carnot cycle operating between the same two temperature limits.
**Cartesian coordinates**- Coordinates within a rectangular Cartesian plane.
**Castigliano's method**- .
**Casting**- Forming of an object by pouring molten metal (or other substances) into a mold.
**Cathode**- The terminal of a device by which current exits.
**Cathode ray**- The stream of electrons emitted from a heated negative electrode and attracted to a positive electrode.
**Cell membrane**- .
**Cell nucleus**- .
**Cell theory**- .
**Center of gravity**- The center of mas of an object, its balance point.
**Center of mass**- The weighted center of an object; a force applied through the center of mass will not cause rotation of the object.
**Center of pressure**- .
**Central force motion**- .
**Central limit theorem**- .
**Central processing unit**- .
**Centripetal acceleration**- .
**Centripetal force**- A force acting against rotational acceleration.
**Centroid**- The average point of volume for an object.
**Centrosome**- .
**Chain reaction**- .
**Change of base rule**- .
**Charles's law**- .
**Chemical bond**- .
**Chemical compound**- .
**Chemical equilibrium**- .
**Chemical kinetics**- .
**Chemical reaction**- .
**Chemistry**- .
**Chloride**- Any chemical compound containing the element chlorine.
**Chromate**- .
**Circular motion**- .
**Civil engineering**- The profession that deals with the design and construction of structures, or other fixed works.
**Clausius–Clapeyron relation**- .
**Clausius inequality**- .
**Clausius theorem**- .
**Coefficient of performance**- .
**Coefficient of variation**- .
**Coherence**- .
**Cohesion**- .
**Combustion**- .
**Compensation**- .
**Compiler**- A computer program that translates a high-level language into machine language.
**Compressive strength**- .
**Computational fluid dynamics**- The numerical solution of flow equations in practical problems such as aircraft design or hydraulic structures.
**Computer**- .
**Computer-aided design**- .
**Computer-aided engineering**- .
**Computer-aided manufacturing**- .
**Computer engineering**- .
**Computer science**- .
**Concave lens**- .
**Condensed matter physics**- .
**Confidence interval**- .
**Conjugate acid**- .
**Conjugate base**- .
**Conservation of energy**- .
**Conservation of mass**- .
**Continuity equation**- .
**Continuum mechanics**- .
**Control systems engineering**- .
**Convex lens**- .
**Corrosion**- .
**Cosmic rays**- .
**Coulomb**- .
**Coulomb's law**- .
**Covalent bond**- .
**Crookes tube**- A type of vacuum tube that demonstrates cathode rays.
**Cryogenics**- The science of low temperatures.
**Crystallization**- .
**Crystallography**- The study of crystals.
**Curvilinear motion**- .
**Cyclotron**- A subatomic particle accelerator using fixed magnets to direct particles into a spiral path.

## D

**Dalton's law**- .
**Damped vibration**- Any vibration with a force acting against it to lessen the vibration over time.
**Darcy–Weisbach equation**- An equation used in fluid mechanics to find the pressure change cause by friction within a pipe or conduit.
**DC motor**- An electrical motor driven by direct current.
**Decibel**- A logarithmic unit of ratios.
**Definite integral**- .
**Deflection**- .
**Deformation (engineering)**- .
**Deformation (mechanics)**- .
**Degrees of freedom**- The number of parameters required to define the motion of a dynamical system.
**Delta robot**- A tripod linkage, used to construct fast-acting manipulators with a wide range of movement.
**Delta-wye transformer**- A type of transformer used in three-phase power systems.
**De Moivre–Laplace theorem**- .
**Density**- The amount of mass in a given unit of volume.
**Derivative**- .
**Design engineering**- .
**Dew point**- The pressure and temperature at which air is holding the maximum possible humidity.
**Diamagnetism**- .
**Dielectric**- An insulator, a material that does not permit free flow of electricity.
**Differential pressure**- .
**Differential pulley**- .
**Differential signaling**- .
**Diffusion**- .
**Dimensional analysis**- .
**Direct integration of a beam**- .
**Dispersion**- .
**Displacement (fluid)**- .
**Displacement (vector)**- .
**Distance**- .
**Doppler effect**- .
**Dose–response relationship**- .
**Drag**- .
**Drift current**- .
**Ductility**- .
**Dynamics**- .
**Dyne**- The CGS unit of force.

## E

**Economics**- The scientific study of the production, distribution and consumption of goods.
**Effusion**- .
**Elastic modulus**- The amount a material will deform per unit force.
**Elasticity**- .
**Electric charge**- .
**Electric circuit**- .
**Electric current**- .
**Electric displacement field**- .
**Electric generator**- .
**Electric field**- .
**Electric field gradient**- .
**Electric motor**- .
**Electric potential**- .
**Electrical potential energy**- .
**Electric power**- .
**Electrical and electronics engineering**- .
**Electrical conductance**- .
**Electrical conductor**- .
**Electrical impedance**- .
**Electrical insulator**- .
**Electrical network**- .
**Electrical resistance**- .
**Electricity**- .
**Electrodynamics**- .
**Electromagnet**- .
**Electromagnetic field**- .
**Electromagnetic radiation**- .
**Electromechanics**- .
**Electron**- .
**Electronvolt**- .
**Electron pair**- .
**Electronegativity**- .
**Electronics**- .
**Elemental analysis**- .
**Endothermic**- A reaction which requires the absorption of heat.
**Energy**- .
**Engine**- .
**Engineering**- .
**Engineering economics**- .
**Engineering ethics**- .
**Environmental engineering**- .
**Engineering physics**- .
**Enzyme**- .
**Escape velocity**- The minimum velocity at which an object can escape a gravitation field..
**Estimator**- .
**Euler–Bernoulli beam equation**- .
**Exothermic**- A reaction which produces heat.

## F

**Factor of safety**- .
**Falling bodies**- .
**Farad**- The SI unit of capacitance.
**Faraday**- .
**Faraday constant**- .
**Fermat's principle**- .
**Fick's laws of diffusion**- .
**Finite element method**- .
**FIRST**- For Inspiration and Recognition of Science and Technology – is an organization founded by inventor Dean Kamen in 1989 to develop ways to inspire students in engineering and technology fields.
**Fission**- .
**Fixed capacitor**- .
**Fixed inductor**- .
**Fixed resistor**- .
**Flow velocity**- .
**Fluid**- .
**Fluid dynamics**- .
**Fluid mechanics**- .
**Fluid physics**- .
**Fluid statics**- .
**Flywheel**- .
**Focus**- .
**Foot-pound**- In the systems that use feet, the unit of work.
**Fracture toughness**- .
**Fraunhofer lines**- .
**Free fall**- .
**Frequency modulation**- .
**Freezing point**- .
**Friction**- .
**Function**- .
**Fundamental frequency**- .
**Fundamental interaction**- .
**Fundamental theorem of calculus**- .
**Fundamentals of Engineering Examination (US)**- .
**Fusion**- .

## G

**Galvanic cell**- .
**Gamma rays**- .
**Gas**- .
**Gauge pressure**- .
**Geiger counter**- A device that measures radioactivity.
**General relativity**- .
**Geometric mean**- .
**Geometry**- .
**Geophysics**- .
**Geotechnical engineering**- .
**Gluon**- .
**Graham's law of diffusion**- .
**Gravitation**- .
**Gravitational constant**- .
**Gravitational energy**- .
**Gravitational field**- .
**Gravitational potential**- .
**Gravitational wave**- .
**Gravity**- .
**Ground state**- .

## H

**Half-life**- The period at which one-half of a quantity of an unstable isotope has decayed into other elements; the time at which half of a substance has diffused out of or otherwise reacted in a system.
**Haptic**- Tactile feedback technology using the operator's sense of touch. Also sometimes applied to robot manipulators with their own touch sensitivity.
**Hardness**- .
**Harmonic mean**- .
**Heat**- The energy of molecular vibration.
**Heat transfer**- .
**Helmholtz free energy**- .
**Henderson–Hasselbalch equation**- .
**Henry's law**- .
**Hertz**- The SI unit of frequency, one cycle per second.
**Hexapod**- (platform) – a movable platform using six linear actuators. Often used in flight simulators they also have applications as a robotic manipulator.
**Hexapod**- (walker) – a six-legged walking robot, using a simple insect-like locomotion.
**Hoist**- .
**Horsepower**- In measurement systems that use feet, the unit of power.
**Huygens–Fresnel principle**- .
**Hydraulics**- The study of fluid flow, or the generation of mechanical force and movement by liquid under pressure.
**Hydrocarbon**- A compound containing hydrogen and carbon atoms only; petroleum is made of hydrocarbons.

## I

**Ice point**- .
**Ideal gas**- A model for gases that ignores inter-molecular forces. Most gases are approximately ideal at some high temperature and low pressure.
**Ideal gas constant**- The constant in the gas law that relates pressure, volume and temperature.
**Ideal gas law**- An equation defining behavior of an ideal gas.
**Indefinite integral**- .
**Identity**- .
**Impedance (electrical)**- .
**Inertia**- .
**Infrasound**- .
**Integral**- .
**Integral transform**- .
**International System of Units**- .
**Interval estimation**- .
**Ion**- .
**Ionic bond**- .
**Ionization**- .
**Impedance**- The measure of the opposition that a circuit presents to the passage of a current when a voltage is applied.
**Inclined plane**- .
**Inductance**- .
**Inductor**- .
**Industrial engineering**- .
**Inorganic chemistry**- .
**Isotope**- .

## J

**Joule**- The SI unit of energy.
**Joule heating**- .

## K

**Kalman filter**- A mathematical technique to estimate the value of a sensor measurement, from a series of intermittent and noisy values.
**Kelvin**- The SI scale for temperature relative to absolute zero.
**Kelvin–Planck statement**- .
**Kinematics**- .

## L

**Laminar flow**- .
**Laplace transform**- .
**LC circuit**- A circuit consisting entirely of inductors (L) and capacitors (C).
**Le Chatelier's principle**- .
**Lenz's law**- .
**Lepton**- .
**Lever**- .
**L'Hôpital's rule**- .
**Light**- .
**Linear actuator**- A form of motor that generates a linear movement directly.
**Linear algebra**- The mathematics of equations where the unknowns are only in the first power.
**Linear elasticity**- .
**Liquid**- .
**Logarithm**- .
**Logarithmic identities**- .
**Logarithmic mean temperature difference**- .
**Lumped capacitance model**- .
**Lumped element model**- .

## M

**Macaulay's method**- .
**Mach number**- The ratio of the speed of an object to the speed of sound..
**Machine**- .
**Machine code**- .
**Machine element**- .
**Machine learning**- .
**Maclaurin series**- .
**Magnetic field**- .
**Magnetism**- .
**Manufacturing engineering**- .
**Mass balance**- .
**Mass density**- .
**Mass moment of inertia**- .
**Mass number**- .
**Mass spectrometry**- .
**Material failure theory**- .
**Material properties**- .
**Materials science**- .
**Mathematical optimization**- .
**Mathematical physics**- .
**Mathematics**- .
**Matrix**- .
**Matter**- .
**Maximum-distortion energy theory**- .
**Maximum-normal-stress theory**- .
**Maximum shear stress**- .
**Maxwell's equations**- A number of basic laws describing the behavior of electric current and potential.
**Mean**- .
**Measures of central tendency**- .
**Mechanical advantage**- .
**Mechanical engineering**- .
**Mechanical filter**- .
**Mechanical wave**- .
**Mechanics**- .
**Mechanism**- .
**Median**- .
**Melting**- .
**Melting point**- .
**Meson**- .
**Metal alloy**- .
**Metallic bond**- .
**Mid-range**- .
**Midhinge**- .
**Mining engineering**- .
**Miller indices**- .
**Mobile robot**- .
**Mode**- .
**Modulus of elasticity**- .
**Mohr's circle**- A graphical method of analyzing the three-dimensional stresses in a system that has a loading force applied to it.
**Molality**- .
**Molar concentration**- .
**Molar absorptivity**- .
**Molar mass**- .
**Molarity**- .
**Molding**- .
**Molecule**- .
**Molecular physics**- .
**Moment of inertia**- .
**Multibody system**- .
**Multidisciplinary design optimization**- .
**Mutual inductance**- .
**Muon**- .

## N

**Nanoengineering**- .
**Nanotechnology**- The technology of systems built with moving parts on the order of a nanometre in size.
- .
**Neutrino**- A neutral particle.
**Newtonian fluid**- .
**Norton's theorem**- .
**Nozzle**- .
*n*th root- To put a number of function to the exponential power of 1/n.
**Nuclear binding energy**- Teh difference between the total mass energy of a nucleus and the mass energy of the isolated nucleons.
**Nuclear engineering**- The profession that deals with nuclear power.
**Nuclear physics**- The science that describes the components of atoms.
**Nuclear potential energy**- The energy that is given up in decay of an unstable nucleus.
**Nuclear power**- The use of energy derived from nuclear chain reactions for electricity production or ship propulsion.

## O

**Ohm**- The SI unit of electrical resistance.
**Ohm's law**- A law describing the relationship between resistance, current, and voltage.
**Optics**- The study of light.
**Organic chemistry**- The study of carbon compounds.
**Osmosis**- The spontaneous movement of molecules or ions through a semi-permable membrane, tending to equalize concentration on both sides.

## P

**Parallel circuit**- A circuit that begins and ends at the same node as another circuit.
**Parity (mathematics)**- .
**Parity (physics)**- .
**Paraffin**- A hydrocarbon compound, solid at room temperature.
**Paramagnetism**- .
**Particle accelerator**- .
**Particle displacement**- .
**Particle physics**- .
**Pascal's law**- .
**Pendulum**- .
**Petroleum engineering**- .
**pH**- A logarithmic measure of the concentration of hydrogen ions in an acid or base solution.
**Phase (matter)**- .
**Phase (waves)**- .
**Phase diagram**- .
**Phase equilibrium**- .
**Photon**- A particle with no rest mass that carries electromagnetic energy.
**Physical chemistry**- .
**Physical quantity**- .
**Physics**- .
**Planck constant**- .
**Plasma physics**- .
**Plasticity**- .
**Pneumatics**- The control of mechanical force and movement, generated by the application of compressed gas.
**Point estimation**- .
**Polyphase system**- An electrical system that uses a set of alternating currents at different phases.
**Power (electric)**- .
**Power (physics)**- .
**Power factor**- .
**Pressure**- The force per unit area .
**Probability**- .
**Probability distribution**- .
**Probability theory**- .
**Psi particle**- .
**Pulley**- .
**Pump**- .

## Q

## R

**Regelation**- The phenomena of melting under pressure, then freezing when the pressure is reduced.
**Relative density**- .
**Relative velocity**- .
**Reliability engineering**- .
**Resistivity**- .
**Resistor**- .
**Reynolds number**- .
**Rheology**- .
**Rigid body**- .
**Robonaut**- A development project conducted by NASA to create humanoid robots capable of using space tools and working in similar environments to suited astronauts..
**Robotics**- .
**Root-mean-square**- .
**Root-mean-square speed**- .
**Rotational energy**- .
**Rotational speed**- .

## S

**Safety data sheet**- .
**Sanitary engineering**- .
**Saturation (chemistry)**- .
**Saturated compound**- .
**Scalar (mathematics)**- .
**Scalar (physics)**- .
**Scalar multiplication**- .
**Screw**- .
**Series circuit**- An electrical circuit in which the same current passes through each component, with only one path.
**Servo**- A motor that moves to and maintains a set position under command, rather than continuously moving.
**Servomechanism**- An automatic device that uses error-sensing negative feedback to correct the performance of a mechanism.
**Shadow matter**- .
**Shear flow**- .
**Shear strength**- .
**Shear stress**- .
**Shortwave radiation**- .
**SI units**- .
**Signal processing**- .
**Simple machine**- A mechanical device that changes the direction or magnitude of a force.
**Siphon**- A closed tube that conveys liquids between two levels without pumping.
**Solid mechanics**- .
**Solid-state physics**- .
**Solid solution strengthening**- .
**Solubility**- .
**Solubility equilibrium**- .
**Sound**- .
**Special relativity**- .
**Specific heat**- The amount of energy required to change the temperature of a unit mass of substance by one degree.
**Specific gravity**- The ratio between the mass density of a substance to that of water.
**Specific volume**- The volume of a unit mass of a substance.
**Specific weight**- The weight of a substance per unit volume.
**Spontaneous combustion**- .
**Stagnation pressure**- .
**Standard electrode potential**- .
**State of matter**- .
**Statics**- The study of forces in a non-moving, rigid body.
**Statistics**- .
**Steam table**- .
**Stefan–Boltzmann law**- .
**Stewart platform**- a movable platform using six linear actuators, hence also known as a Hexapod.
**Stiffness**- .
**Stoichiometry**- .
**Strain**- .
**Strain hardening**- .
**Strength of materials**- .
**Stress**- .
**Stress–strain analysis**- .
**Stress–strain curve**- .
**Structural analysis**- .
**Structural load**- .
**Sublimation**- .
**Subsumption architecture**- a robot architecture that uses a modular, bottom-up design beginning with the least complex behavioral tasks.
**Surface tension**- .
**Superconductor**- .
**Superhard material**- .
**Supersaturation**- .
**Surgical robot**- a remote manipulator used for keyhole surgery.

## T

**Tangential acceleration**- .
**Technical standard**- .
**Temperature**- The measure of heat energy in an object or fluid.
**Tempering (metallurgy)**- Heat treatment to alter the crystal structure of a metal such as steel.
**Tensile force**- Pulling force, tending to lengthen an object.
**Tensile modulus**- .
**Tensile strength**- .
**Tensile testing**- .
**Tension member**- .
**Thermal conduction**- .
**Thermal equilibrium**- .
**Thermal radiation**- .
**Thermodynamics**- The science of the flow of heat.
**Theory of relativity**- .
**Thévenin's theorem**- .
**Three-phase**- Electric power using three alternating currents, displaced in time.
**Torque**- Twisting force.
**Torsional vibration**- .
**Toughness**- .
**Trajectory**- .
**Transducer**- .
**Transformer**- .
**Trigonometric functions**- .
**Trigonometry**- .
**Trimean**- .
**Triple point**- .
**Trouton's rule**- .
**Truncated mean**- .
**Truss**- .
**Turbine**- .
**Turbomachinery**- .
**Turbulence**- .

## U

**Ultimate tensile strength**- .
**Uncertainty principle**- .
**Unicode**- .
**Unit vector**- .
**Unsaturated compound**- .
**Upthrust**- .
**Utility frequency**- .

## V

**Vacuole**- .
**Vacuum**- An absence of mass in a volume.
**Valence**- .
**Valence band**- .
**Valence bond theory**- .
**Valence electron**- .
**Valence shell**- .
**Valve**- A device for controlling fluid flow.
**van der Waals equation**- .
**van der Waals force**- .
**van 't Hoff equation**- .
**van 't Hoff factor**- .
**Variable capacitor**- .
**Variable resistor**- .
**Vector space**- .
**Venturi effect**- .
**Vibration**- .
**Viscoelasticity**- .
**Viscosity**- .
**Volt-ampere**- .
**Volt-ampere reactive**- .
**Volta potential**- .
**Voltage**- .
**Volumetric flow rate**- .
**von Mises yield criterion**- .

## W

**Watt**- The SI unit of power, rate of doing work.
**Wave**- .
**Wavelength**- .
**Wedge**- .
**Weighted mean**- .
**Wet-bulb temperature**- The temperature of a wetted thermometer with an air current across it. Used in psychrometry. .
**Wheel and axle**- .
**Winsorized mean**- .
**Work hardening**- .

## X

## Y

**Y-coordinate**- .
**Yield**- The point of maximum elastic deformation of a material; above yield the material is permanently deformed.
**Young's modulus**- A measure of the stiffness of a material; the amount of force per unit area require to produce a unit strain.

## Z

**Zero defects**- A quality assurance philosophy that aims to reduce the need for inspection of components by improving their quality.
**Zero force member**- .
**Zeroth law of thermodynamics**- The equivalence principle applied to temperature; two systems in thermal equiplbirum with a third are also in thermal equilibrium with each other.

## See also

- Engineering
- National Council of Examiners for Engineering and Surveying
- Fundamentals of Engineering Examination
- Principles and Practice of Engineering Examination
- Graduate Aptitude Test in Engineering
- Glossary of aerospace engineering
- Glossary of civil engineering
- Glossary of electrical and electronics engineering
- Glossary of mechanical engineering
- Glossary of structural engineering
- Glossary of architecture
- Glossary of areas of mathematics
- Glossary of artificial intelligence
- Glossary of astronomy
- Glossary of biology
- Glossary of calculus
- Glossary of chemistry
- Glossary of ecology
- Glossary of economics
- Glossary of physics
- Glossary of probability and statistics

## References

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