This page gathers the 3,177 dictionary entries belonging to the domain “Physics”, as labelled by Wiktionary. Each word leads to its full entry: definitions, etymology, pronunciation, examples. Page 30 of 32: from “time constant” to “twinjet”.
- time constant noun The time in which a physical system's response to a step-wise change in an external variable reaches approximately 63% of its final…
- time projection chamber noun A type of particle detector that uses a combination of electric fields and magnetic fields together with a sensitive volume of gas or…
- time reversal noun T-symmetry.
- time reversal invariance noun The principle that if a sequence of events is possible, then the same sequence is also possible in the reverse order.
- time reversal mirror noun A device that uses a transducer to sample, to reverse in time, and to reemit an acoustic field or another type of wave.
- time stop noun A stop (mechanical part that adjusts an aperture or interval size) which operates on a timer.
- time stretch analog-to-digital converter noun A device for digitizing analog signals of very high bandwidth, effectively slowing down the original signal in time (or compressing its…
- time switch noun A switch activated automatically at a preset time.
- time-aligned adj Of a sound system, in which the speakers are configured correctly to eliminate timing problems, so that the sound produced by each driver…
- time-average equation noun The equation, 1/(V_M)=ϕ/(V_F)+(1-ϕ)/(V_R), used in acoustic log interpretation as a measurement of formation porosity.
- time-domain reflectometer noun An electronic instrument used to determine the characteristics of electrical lines by observing reflected pulses.
- time-domain reflectometry noun A technique used to track faults in networks, such as cable breaks or loose connections, in which a pulse of a known shape is transmitted…
- time-frequency analysis noun A technique that studies a signal in both the time and frequency domains simultaneously, using various time-frequency representations.
- time-of-flight mass spectrometry noun a technique of separating ions of different masses by measuring the time taken to traverse a fixed distance through a magnetic field
- time-of-use meter noun A device that measures and records the usage of electricity during a prespecified period of the day cumulatively over a meter reading…
- time-of-use rates noun A dynamic electric rate schedule that adjusts prices that are dependent on peak usage, as based on the time of day and season.
- time-ordered adj Of a definition, presenting information in a specific chronological order, starting from the earliest event or concept and moving forward…
- time-reverse verb To subject something to a transformation in which the passage of time and all of its velocities are theorized to be reversed.
- time-varying adj Referring to any voltage of a varying time, current or an electromagnetic wave carrying information.
- timelike adj Of a four-vector in representing a point in spacetime, having a positive or negative four-vector norm for the metric signature (+, -, -, -)…
- tissue equivalent material noun material that mimics the properties of human or animal tissue, particularly in their interactions with radiation
- titanium-46 noun A minor stable isotope of titanium, 4622Ti, having twenty-two protons and twenty-four neutrons; it amounts to about 8% of the element in…
- titanium-47 noun A minor stable isotope of titanium, 4722Ti, having twenty-two protons and twenty-five neutrons; it amounts to about 7% of the element in…
- titanium-48 noun The major stable isotope of titanium, 4822Ti, having twenty-two protons and twenty-six neutrons; it amounts to about 74% of the element in…
- titanium-49 noun A minor stable isotope of titanium, 4922Ti, having twenty-two protons and twenty-seven neutrons; it amounts to about 5% of the element in…
- titanium-50 noun A minor stable isotope of titanium, 5022Ti, having twenty-two protons and twenty-eight neutrons; it amounts to about 5% of the element in…
- toby box noun A box containing a service (fibre optic microducts, mains water, etc.) set into the street or verge for connection to a property, typically…
- tombstoning noun An unwanted effect in the manufacture of electronic circuit boards, in which a component stands up on end instead of lying flat.
- tonic adj Pertaining to tension, especially of the muscles.
- top noun A top quark.
- top quark noun A quark having a fractional electric charge of +2/3 and a mass of about 178,000 MeV.
- topcolor noun A proposed model of fundamental particle physics involving condensation between top quarks and antitop quarks
- topness noun A quantum number of quarks and hadrons, determined by the number(s) of top quarks and antiquarks present. Symbol T.
- topological soliton noun A type of soliton that forms the transition between two adjoining structures or spaces which are "out of phase" in such a way that the…
- toponium noun Any hypothetical meson formed from a top quark and its antiquark; would be very unstable because of the large mass of the top quark
- torque noun A rotational or twisting effect of a force; a moment of force, defined for measurement purposes as an equivalent straight line force…
- tortuosity noun A property of curve being tortuous, commonly used to describe diffusion in porous media.
- total internal reflection noun A phenomenon where light, instead of passing into a medium of a lower refractive index and refracting away from the normal, is completely…
- toughness noun Resistance to fracture when stressed, or the degree of such resistance.
- trace noun A current-carrying conductive pathway on a printed circuit board.
- tracking noun The synchronization of two or more signals.
- transactinide adj Lying beyond lawrencium (the last actinide) in the periodic table; having an atomic number greater than 103.
- transduction noun The conversion of energy (especially light energy) into another form, especially in a biological process such as photosynthesis or in a…
- transfermium adj Describing any element that lies beyond fermium in the periodic table; having an atomic number greater than 100.
- transfluorescence noun Fluorescence of a material when the source of stimulating radiation is behind the object, from the point of view of the observer.
- transform verb To subject to the action of a transformer.
- transformer noun A static device that transfers electric energy from one circuit to another by magnetic coupling; primarily used to transfer energy between…
- transient noun A transient phenomenon, especially an electric current; a very brief surge.
- transition point noun The point in space at which fluid flow around an object changes from laminar to turbulent.
- transition temperature noun The temperature at which one phase of a material changes into another; a transition point
- transition time noun The amount of time required for the switch output to settle within a given percentage of the final value following a change in the control…
- transition zone noun The stage in the flow or a fluid during which it changes from laminar to turbulent
- translate verb To subject (a body) to linear motion with no rotation.
- translation noun A motion or compulsion to motion in a straight line without rotation or other deformation.
- translational adj Relating to movement of a body in a straight line.
- translational energy noun The energy of the molecules of a fluid due to their (translational, as opposed to rotational or vibrational) motion.
- transmission electron diffraction noun A type of electron diffraction in which a beam of electrons is transmitted through a thin layer of sample.
- transmissivity noun A measure of the capacity of a material to transmit radiation (the ratio of the amounts of energy transmitted and received)
- transmittance noun The fraction of incident light, or other radiation, that passes through a substance.
- transmittant adj That passes through a substance.
- travel time noun Alternative form of traveltime.
- traveller noun One of the wires connecting the two members of a pair of three-way switches.
- travelling wave noun A wave that is not bounded by a given space, but can propagate freely.
- travelling-wave tube noun A type of vacuum tube which amplifies electromagnetic signals, where the electron gun fires down the tube with an unmodulated electron…
- triac noun A three-terminal electronic component that conducts current in either direction when triggered; a bidirectional triode thyristor.
- triad noun On a CRT display, a group of three neighbouring phosphor dots, coloured green, red, and blue.
- triboelectric series noun A list of materials, showing which are more or less prone to acquire a positive or negative electric charge when rubbed.
- tribology noun The science and engineering of interacting surfaces in relative motion; the study and application of technology using the principles of…
- trifocal adj Involving three foci.
- trigger verb To activate; to become active.
- trijet noun Three jets of particles from an event or source.
- trilepton noun Any particle formed from three leptons
- trimmer noun An adjustable electrical component.
- triode noun A thermionic valve containing an anode, a cathode, and a control grid; small changes to the charge on the grid control the flow from…
- trip noun A trip-switch or cut-out.
- trip out verb To break a circuit in response to an overload.
- trip switch noun A device to halt the current flow, a cut-out or trip.
- triphoton noun A composite particle created by overlapping three indistinguishable photons in an optical fibre and manipulating their spin
- triple point noun The unique temperature and pressure at which the solid, liquid and gas phases of a substance are all in equilibrium.
- tripler noun The simplest form of frequency multiplier, that has an output frequency of three times the value of the input frequency.
- triplet noun A triquark.
- tripolar adj Having three poles.
- tristated adj In a high-impedance state that is neither the high output state nor the low output state, and allows other devices to drive the bus without…
- tritium noun A radioactive isotope of the element hydrogen (symbol T, ³H or 31H) having one proton and two neutrons.
- triton noun the nucleus of a tritium atom, consisting of a proton and two neutrons.
- true adj one of two states of a Boolean variable; logic 1.
- truth noun Topness; the property of a truth quark.
- tunnel verb To undergo the quantum-mechanical phenomenon where a particle penetrates through a barrier that it classically cannot surmount.
- tunnel diode noun A semiconductor diode that has negative resistance in the forward direction of its operating range due to quantum effects.
- tunneling noun The quantum mechanical passing of a particle through an energy barrier.
- tunnelling time noun The amount of time required for the ground state to develop the underbarrier wavefunction components necessary to attain the static field…
- turbulent flow noun A form of irregular viscous flow in which the velocity and pressure of the fluid fluctuates at random in both time and space,
- turgor noun The pressure produced by a solution in a space that is enclosed by a differentially permeable membrane.
- turn-by-turn navigation noun A feature of GPS devices, particularly smartphones, that continuously gives directions as the person or vehicle approaches navigation…
- turn-off time noun The amount of time between the moment the anode current reaches zero and the moment the reverse voltage due to the practical circuit…
- turn-on time noun The amount of time required for a device to change from a forward blocking mode to a forward conduction mode when a gate pulse is applied.
- turned on adj That has been switched on or placed in the on position.
- turret noun A tower-like solder post on a turret board (a circuit board with posts instead of holes).
- tweeter noun An electronic speaker designed to produce high-frequency sound.
- twinjet noun Two jets of particles from an event or source.