positron emission tomography PET | using a computerized radiographic technique to examine the metabolic activity in various tissues (especially in the brain) |
emission emanation | the act of emitting, causing to flow forth |
field-emission microscope | electron microscope used to observe the surface structure of a solid |
gas heat | heating system that burns natural gas |
heat engine | any engine that makes use of heat to do work |
heat exchanger | device that transfers heat from one liquid to another without allowing them to mix |
heating system heating plant heating heat | utility to warm a building, the heating system wasn't working, they have radiant heating |
heat lamp infrared lamp | electric heater consisting of a high-power incandescent lamp that emits infrared radiation, the bathroom could be warmed by an infrared lamp |
heat pump | apparatus that extracts heat from a liquid that is at a higher temperature than its surroundings, can be used to transfer heat from a reservoir outside in order to heat a building |
heat-seeking missile | a missile with a guidance system that directs it toward targets emitting infrared radiation (as the emissions of a jet engine) |
heat shield | a protective covering that protects a spacecraft from overheating on reentry |
heat sink | a metal conductor specially designed to conduct (and radiate) heat |
positron emission tomography scanner PET scanner | a tomograph that produces cross-sectional Xays of metabolic processes in the body |
steam heat steam heating | a heating system in which steam is generated in boilers and piped to radiators |
heat warmth passion | the trait of being intensely emotional |
heat content total heat enthalpy H | (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure, enthalpy is the amount of energy in a system capable of doing mechanical work |
body temperature blood heat | temperature of the body, normally . F or C in humans, usually measured to obtain a quick evaluation of a person's health |
hotness heat high temperature | the presence of heat |
fieriness red heat | the heat or the color of fire |
white heat | the hotness of something heated until it turns white |
thermal barrier heat barrier | a limit to high speed flight imposed by aerodynamic heating |
heat warmth | the sensation caused by heat energy |
kinetic theory of heat | a theory that the temperature of a body increases when kinetic energy increases |
dead heat | a tie in a race |
heat flash | a flash of intense heat (as released by an atomic explosion) |
heat lightning | bright flashes of light near the horizon without thunder (especially on hot evenings), usually attributed to distant lightning that is reflected by clouds |
emission | the occurrence of a flow of water (as from a pipe) |
heat | a preliminary race in which the winner advances to a more important race |
emission spectrum | spectrum of electromagnetic radiation emitted by a self-luminous source |
heat heat energy | a form of energy that is transferred by a difference in temperature |
infrared infrared light infrared radiation infrared emission | electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves |
heat of dissociation | the heat required for a fluid substance to break up into simpler constituents |
heat of formation | the heat evolved or absorbed during the formation of one mole of a substance from its component elements |
heat of solution | the heat evolved or absorbed when one mole of a substance is dissolved in a large volume of a solvent |
latent heat heat of transformation | heat absorbed or radiated during a change of phase at a constant temperature and pressure |
heat of condensation | heat liberated by a unit mass of gas at its boiling point as it condenses into a liquid, the heat of condensation is equal to the heat of vaporization |
heat of fusion | heat absorbed by a unit mass of a solid at its melting point in order to convert the solid into a liquid at the same temperature, the heat of fusion is equal to the heat of solidification |
heat of solidification | heat liberated by a unit mass of liquid at its freezing point when it solidifies |
heat of sublimation | heat absorbed by a unit mass of material when it changes from a solid to a gaseous state |
heat of vaporization heat of vaporisation | heat absorbed by a unit mass of a material at its boiling point in order to convert the material into a gas at the same temperature |
specific heat | the heat required to raise the temperature of one gram of a substance one degree centigrade |
heat ray | a ray that produces a thermal effect |
heat wave | a wave of unusually hot weather |
radio wave radio emission radio radiation | an electromagnetic wave with a wavelength between . cm to , m |
discharge emission expelling | any of several bodily processes by which substances go out of the body, the discharge of pus |
emission | the release of electrons from parent atoms |
field emission | the emission of electrons that are stripped from parent atoms by a high electric field |
heat dissipation | dissipation of heat |
nocturnal emission | ejaculation during sleep (usually during a dream) |
photoelectric emission | the release or absorption of quanta above a certain energy level |