Temperature, Heat amp; Expansion CypressFairbanks High 度，热amp；膨胀高柏班克斯.pptVIP

Flame – if you increase molecule movement the liquid will warm Pressure – rapidly compress air in a tire pump and it will also warm Temperature, Heat Expansion Three ways to increase average kinetic energy of molecules: Work – hitting a penny with a hammer will cause molecules to move faster Temperature Scales: Celsius: 0? defined by water freezing 100? defined by water boiling Fahrenheit 32? defined by water freezing 212? defined by water boiling Kelvin Degrees are the same size as Celsius scale Absolute zero: = 0 ? Kelvin = -273 ? Celsius = 0 Kinetic Energy Temperature Proportional to the average kinetic energy Compare the total KE of 2 L of water to 1 L of water The direction of spontaneous energy transfer is from warmer to a cooler substance. Heat (Thermal Energy) Energy that transfers from one object to another because of a temperature difference Does matter contain heat? No, matter contains energy and heat is energy transmitted due to temperature difference Thermal Contact When heat flows from one object or substance to another it is in contact with… Direction of heat flow…high to low temperature of substances Heat flows according to…temperature differences Heat never flows…from a cooler substance into a hotter substance Thermal Equilibrium When objects in thermal contact with each other reach the same temperature How a thermometer works… When a thermometer is in contact with a substance, heat flows between them until they have the same temperature. Internal Energy The total of all energies inside a substance When a substance absorbs heat, this energy may cause the molecules to move faster or if no change in temperature occurs the substance changes phase. Units of Heat Calorie Amount of heat required to raise the temperature of 1 g of water by 1 ?C Kilocalorie Amount of heat required to raise the temperature of 1 kg of water by 1 ?C - Also known as the food Calorie Joule: 1 calorie = 4.184 J 1 kilocalorie = 4184 J Mechanical