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8.1 Temp and Heat

# 8.1 Temp and Heat - Heat and Temperature Temperature and...

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1 Temperature and Heat 8.1 Temperature Heat Heat capacity Phase change heat of fusion heat of vaporization Heat and Temperature Heat is a quantity of thermal energy. The amount of heat depends on the size of the object Temperature is the measure of the “strength” or “pressure” of thermal energy. The Temperature level does not depend on the size of the object Heat flows into the object and raises the temperature Microscopic and Macroscopic description of heat Thermodynamics- Macroscopic description or heat and temperature Statistical Mechanics- Microscopic description in terms of microscopic properties i.e. molecular mass, velocities averaged over many particles. Heat High Temperature Low Temperature Thermal Energy Thermal energy is in some sense a form of mechanical energy spread over a large number of particles. But there are some important differences between mechanical energy of a ball and the microscopic thermal energy of atoms. Mechanical energy can be converted into thermal energy with 100% efficiency. Thermal energy cannot be converted into mechanical energy with 100% efficiency. Thermal equilibrium Two objects in thermal contact until no changes occur are in thermal equilibrium and have the same Temperature.

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