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 22 of 32: from “Planck charge” to “prebaking”.
- Planck charge noun One of the base units in the system of Planck units, equal to an electric charge of:q_p=√≈1.875×10⁻¹⁸ mbox C
- Planck current noun An electric current flowing at a rate of one Planck charge per Planck time: I_p=√≈3.479×10²⁵ mbox A.
- Planck energy noun A natural unit of energy, equivalent to the mass energy of a Planck particle (E_P=c^(2m_P)≈1.95608×10⁹J) or the energy per quantum at a…
- Planck force noun The unit of force in the system of Planck units, equal to the amount of force required to accelerate one Planck mass by one Planck…
- Planck frequency noun A repeating event that occurs once every Planck time, with a frequency of F_p=1/(2π)√=E_P/h≈2.952×10⁴² mbox Hz. this frequency is said to…
- Planck length noun A unit of length, believed to be the scale at which quantum gravity effects become significant, that is defined in terms of the speed of…
- Planck particle noun A hypothetical particle having physical quantities on the Planck scale, most importantly being one Planck mass in mass.
- Planck power noun The unit of power in the system of Planck units, equal to transferring one Planck energy in one Planck time: P_p=(c⁵)/G≈3.628×10⁵² mbox W
- Planck pressure noun The unit of pressure in the system of Planck units, equal to one Planck force in one Planck area (or one Planck energy in one Planck…
- Planck relic noun A black hole with an event horizon on the order of a Planck length (~ 10⁻³⁵ metres), and a mass on the order of a Planck mass (~ 20…
- Planck scale noun The scale at which quantum-mechanical effects become significant to depicting spacetime and other gravitational phenomena, typically…
- Planck speed noun The velocity equal to one Planck length per Planck time; equal to the speed of light. Symbol is v_P or c.
- Planck temperature noun The fundamental upper limit of temperature conceivable under current models of physics, in which all matter is accelerated as quickly as…
- Planck time noun A natural unit of time, equivalent to the time it takes light to traverse one Planck length; it is the duration of time at which quantum…
- Planck unit noun Any one of several natural units in a system originally proposed by Max Planck based on universal constants. Symbols for Planck units are…
- Planck voltage noun The voltage between two points that use one Planck energy for every Planck charge that passes through: V_p=√≈1.043×10²⁷ mbox V
- Planckian adj Relating to the Planck length or Planck time.
- plane wave noun A constant-frequency wave whose wavefronts are infinite parallel planes of constant peak-to-peak amplitude normal to the phase velocity…
- plaquette noun The smallest closed loop, enclosing the region between four lattice sites, in lattice gauge theory.
- plasma noun A state of matter consisting of partially ionized gas and electrons.
- plasma acceleration noun A method for accelerating electrically charged particles with a large-amplitude electron plasma wave.
- plasma accelerator noun A particle accelerator that uses plasma as the medium of the accelerating field instead of a vacuum, to obtain a larger accelerating…
- plasma wakefield acceleration noun A method of high-gradient particle acceleration which uses the longitudinal electric field of plasma wakefield excited by a laser pulse or…
- plasma wakefield accelerator noun A device in which a drive beam (either laser or particle) produces a plasma wave ("wakefield") that accelerates charged particles in a…
- plasmon noun The quantum of waves produced by the collective effects of large numbers of electrons when disturbed from equilibrium.
- plasmonic adj Of or pertaining to plasmons, the quasiparticles resulting from the quantization of plasma oscillations.
- plastic flow noun Any fluid flow in which movement is proportional to the applied force (above the yield value).
- plasticity noun The property of a solid body whereby it undergoes a permanent change in shape or size when subjected to a stress exceeding a particular…
- plate noun A flat electrode such as can be found in an accumulator battery, or in an electrolysis tank.
- player noun An electronic device that plays audio or video media.
- plenum noun A space that is completely filled with matter.
- pleochroism noun The optical phenomenon in some coloured, transparent crystals (such as tourmaline and opal) in which the colour changes when viewed from…
- plug noun A pronged connecting device which fits into a mating socket, especially an electrical one.
- plus adj Electrically positive.
- pMOSFET noun A type of metal–oxide–semiconductor field-effect transistor (MOSFET) that utilizes an p-type channel, conducting when a voltage voltage…
- PNP noun Ellipsis of PNP transistor.
- Poincaré recurrence time noun Of certain systems, the total amount of time required for the system to revert to a state that is almost identical to its current state.
- point blank adj The distance between a firearm and a target where a projectile in flight is expected to strike the centre of the target without adjusting…
- point-to-point adj Being or relating to a method of manually constructing electronic circuits prior to automation and printed circuit boards, where components…
- pointlike adj Having dimensions too small to be measured, or so small that it may be regarded as a point
- poise noun A CGS unit of dynamic viscosity equal to one dyne-second per square centimetre.
- polarimetry noun The measurement of the polarization of electromagnetic radiation
- polariton noun Any of a class of quasiparticles comprising elements of electromagnetic waves and excited states of matter.
- polarity noun A measure of the electrical potential at the ends of a circuit. ᵂᵖ
- polarizability noun The relative tendency of a system of electric charges to become polarized in the presence of an external electric field.
- polarization noun The production of polarized light; the direction in which the electric field of an electromagnetic wave points.
- polarization charge noun An electric charge that appears on the surface or within a dielectric material due to the polarization process induced by an external…
- polarization vector noun One of a set of three spacelike (and possibly also one timelike) four-dimensional vectors which are orthonormal within some inertial…
- polarizer noun Any device that produces polarized light.
- polaron noun The object (a quasiparticle) that results when an electron (or hole) in the conduction band of a crystalline insulator or semiconductor…
- pole noun A contact on an electrical device (such as a battery) at which electric current enters or leaves.
- poloidal adj Between the poles of a magnet.
- polonium-210 noun A radioactive isotope of polonium, 21084Po, having a half-life of 138 days; it as used as a reference alpha emitter in the calibration of…
- polychromatic adj Composed of more than one wavelength.
- polyfold adj Having the same total and azimuthal quantum numbers, similar energy values, but different inner quantum numbers.
- polyhedron noun A polyscope, or multiplying glass.
- polyphase adj Of, pertaining to, or involving multiple alternating currents that have the same frequency but differ in phase.
- polyphase circuit noun A group of alternating current circuits having two or more interrelated voltages, usually of equal amplitudes, phase differences, and…
- polysilicon noun Polycrystalline silicon: A polycrystalline form of silicon used in some solid-state devices, especially solar cells.
- polytropic adj of any change in the thermodynamic properties of a gas in which its specific heat remains constant
- pomeron noun A Regge trajectory postulated in 1961 to explain the slowly rising cross section of hadronic collisions at high energies.
- ponderable adj Having a detectable amount of matter; having a measurable mass.
- pop noun The sixth derivative of the position vector with respect to time (after velocity, acceleration, jerk, jounce, crackle), i.e. the rate of…
- populate verb To fill initially empty slots or sockets on a circuit board or similar.
- population inversion noun The creation of a system in which more atoms or molecules are in an excited state than in a ground state.
- position noun A pin; a connector.
- positive adj Having more protons than electrons.
- positive crystal noun A doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former…
- positive feedback noun A feedback loop in which the output of a system is amplified with a net positive gain and added to the input signal before the main…
- positive logic noun The use of the higher voltage level to represent the Boolean value 1 and the lower voltage level to represent the Boolean value 0. For…
- positivity noun The characteristic of possessing a positive electric charge.
- positronium noun An exotic atom (specifically, an onium) consisting of a positron (antielectron) and an electron, as a particle–anti-particle bound pair…
- post office box noun A test instrument once used by telephone engineers.
- post-transistor adj belonging to the time (late 1960s) after individual transistors were replaced by integrated circuits
- pot verb To package a circuit by encasing it in resin.
- potassium-39 noun The major stable isotope of potassium, 3919K, having nineteen protons and twenty neutrons; it amounts to over 93% of the element in nature
- potassium-40 noun A naturally-occurring radioactive isotope of potassium, 4019K, having 19 protons and 21 neutrons, and a half-life of 1.3 billion years; it…
- potassium-42 noun An artificially produced radioactive isotope of potassium, 4219K, having a half-life of 12.4 hours; used in medicine as a tracer
- potassium-43 noun An artificially produced radioactive isotope of potassium, 4319K, having a half-life of 22 hours; used in medicine as a tracer
- potential noun The gravitational potential: the radial (irrotational, static) component of a gravitational field, also known as the Newtonian potential or…
- potential well noun the region surrounding a local minimum of potential energy, especially if the potential has a constant value in an interval and a higher…
- potentiality noun Quantum potential.
- potentiometer noun A user-adjustable three-terminal variable resistor that can be used as a voltage divider.
- poundal noun A unit equal to the force needed to accelerate a mass of one pound at a rate of one foot per second per second.
- power noun The rate at which work is done or energy is transferred, expressed in units of energy per unit of time.
- power brick noun A power supply for an electronic device which is similar in size, shape, and weight of a brick, which plugs into the device using a cord…
- power consumption noun The amount of power used multiplied by the amount of time, measured either in kilowatt-hours, horsepower-hours, etc.
- power electronics noun A technology and engineering field within electronics, concerning electric power delivery and distribution.
- power factor noun The ratio of the actual power to the apparent power in an alternating current power system; specifically, the cosine of the phase angle…
- power scaling noun The act of increasing the output power of a laser without changing the geometry, shape, or principle of operation.
- power to gas noun The storing of generated electrical power as a gaseous substance, usually by electrolyzing water into hydrogen and oxygen gases and…
- power-cycle verb To turn a device off and then back on again, usually to restore proper function by forcing a malfunctioning or unresponsive device to reset…
- power-hungry adj Of a device, using or requiring a large amount of electrical power.
- Poynting vector noun The vector obtained in the direction of a right-hand screw from the cross product (vector product) of the electric field vector rotated…
- pp noun proton and proton (used attributively to describe a collision or other interaction of these two particles)
- ppbar noun proton and antiproton (used attributively to describe a collision or other interaction of these two particles)
- PR noun Abbreviation of preset.
- Prandtl number noun A dimensionless number (symbol Pr) defined as the ratio of momentum diffusivity to thermal diffusivity.
- preaccelerator noun Any accelerator that accelerates particles and feeds them to a larger accelerator for further acceleration
- prebaking noun surface modification by heating prior to another operation