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### 27 Cards in this Set

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 The quantity that indicates how warm or cold an object is with respect to some standard. Temperature The number assigned to the lowest possible temperature Absolute zero What is the number scale with no negative numbers? Kelvin scale The energy resulting from heat flow Thermal energy The energy transferred from one object to another because of a tempreature difference between them. Heat From the higher-temperature substance to the lower-temperature substance. Heat flow Never flows of itself from a lower-temperature substance into a higher-temperature substance. Depends on the amount of matieral. Heat flow When a substance absorbs or gives off heat, the _____energy of the substance increases or decreases. Internal Transmission of heat through energy transfer from particle to particle within certain matierals, or from one matieral to another when two are in direct contact Conduction Heat transfer due to the actual motion of the fluid itself. Involves the motion of blobs of matter (the overall motion of a fluid) Convection Energy transmitted by electromagnetic waves Radiation The change of phase from liquid to gas that occurs at the surface of a liquid Evaporation The changing of a gas into a liquid Condensation The change of phase throughout a liquid rather than only at the surface. Boiling If enough heat is absorbed, the attractive forces between the molecules will no longer be able to hold them together Melting As energy is withdrawn from a liquid, molecular motion diminishes until the molecules, on the average, are moving slowly enough so that the attractive forces between them are able to cause cohesion Freezing Phase of matter beyond the liquid phase, wherein molecules fill whatever space is avalible to them, taking no definite shape Gas Phase of matter between the solid and gaseous phases in which the matter possesses a definite volume but no definite shape Liquid Phase of matter characterized by definite volume and shape. Solid Requires a transfer of energy Change of Phase When the tempreature of a substance is increased, its molecules or atoms jiggle faster and move farther apart, on the average. Thermal expansion Quantity of heat required to raise the temperature of a unit mass of a substance by one degree Celcius Specific heat capacity Metals Thermal conductors Wood, wool, straw, paper, cork, styrofoam, and most liquids and gasses Thermal insulators A change of phase takes place at a constant... temperature The distance between adjacent crests of a wave is a measure of a wave's... wavelength. T or F: Sound waves require a medium for propagation True