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21 Cards in this Set

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 R-value a measurement of the insulating ability of a substance kilocalorie (kcal) the energy stored in foods if 1 kg of water is heat 1 degree celcius, a kilocalorie is required caloric theory a theory that defined thermal energy as a substance that flowed from hot bodies into cold bodies thermal equilibrium when two objects in contact are the same temperature and conduction stops convection the flow of thermal energy fro one place to another by the movement of particles convection current a mass of moving particles that carries thermal energy thermal expansion an increase in the volume of a substance caused by the addition of thermal energy thermodynamics the branch of physics that deals with thermal energy kinetic theory of thermal energy identifies the thermal energy of an object with the motion of its particles calorie (cal) the amount of thermal energy required to increase the temperataure of 1 g of water 1 degree C entropy the amount of disorder and randomness in a system; unusable energy insulators a substance that does not conduct electricity or heat very well convection the flow of thermal energy from one place to another by the movement of particles heat the kinetic energy present within the particles of matter; the transfer of thermal energy conduction the flow of thermal energy from an object to another object through contace heat of fusion the amount of thermal energy needed to change a substance from its solid phase to its liquid phase radiation the transportation of thermal energy without the use of matter temperature the measure of the average kinetic energy in a material heat of vaporization the amount of thermal energy needed to change a substance from its liquid phase to its gaseous phase specific heat the amount of thermal energy needed to raise the temperature of 1 g of a substance 10 C conductor any substance that will allow the flow of thermal energy; in electricity, a substance that holds its valence electrons loosely, allowing the flow of electricity