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### 20 Cards in this Set

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 heat the transfer of energy between objects at different temperatures thermal energy the total energy of the particles that make up a substance direction of heat transfer higher temperature to lower temperature what 2 things determine the amount of thermal energy temperature & how much of the substance you have conductor transfer of thermal energy from one substance to another through direct contact conductor conducts thermal energy well insulator does not conduct thermal energy well convection transfer of thermal energy by the movement of a liquid or gas convection current circular motion of liquids or gases due to density differences caused by temp. differences radiation transfer of energy through matter or space as electromagnetic waves greenhouse effect warming due to trapped radiation by atmosphere thermal conductivity the rate at which a substance conducts thermal energy specific heat capacity the amount of heat energy needed to change the temperature of 1 kg of a substance by 1 degree celsius calorimeter a device used to determine the specific heat capacity of a substance calorie the amount of energy needed to change the temperature of 0.001 kg of WATER by 1 degree celsius kilocalorie 1000 calories, used on food labels, Calorie (capital C) Difference between temp. and thermal energy temp = average kinetic energy thermal energy = the total energy of a substance temperature expressed in degrees fahrenheit, degrees celsius, or Kelvin thermal energy expressed in joules heat expressed in joules or calories