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Physics-Chapter16

Physics-Chapter 16 Heat

TermDefinition
conduction the transfer of heat energy by molecular and electron collisions within a substance (especially a solid).
insulators substances that are poor conductors because the outer electrons are firmly attached.
convection the transfer of heat energy in a gas or liquid by means of currents in the heated fluid. The fluid moves, carrying energy with it.
radiation the transfer of energy by means of electromagnetic waves.
radiant energy energy that is transferred via radiation.
electromagnetic waves the form through which radiant energy is transferred.
electromagnetic spectrum the range of frequencies at which radiant energy can travel.
terrestrial radiation the radiation that is emitted by Earth to outer space
Newton's law of cooling the rate of loss of heat from a warm object is proportional to the temperature difference between the object and its surroundings (Similarly for the gain of heat by a cool object.)
greenhouse effect Warming of the lower atmosphere by short-wavelength radiation from the Sun that penetrates the atmosphere is absorbed by Earth and is reradiated at longer wavelengths that cannot easily escape Earth's atmosphere.
global warming the result of an increase of greenhouse gases causing an increase of reflection of radiant energy by the atmosphere.
solar power Energy per unit time derived from the Sun
solar constant 1400 J/m2 received from the Sun each second at the top of Earth's atmosphere on an area perpendicular to the Sun's rays; expressed in terms of power, 1.4kW/m2
Created by: vahajuddin
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