Vocab

> Temperature: Measure of the average kinetic energy of all the particles in an object. > **__Thermal Energy:__** Sum of the kinetic and potential energy of the particles in an object; is transferred by conduction, convection, and radiation. > **__Heat:__** Thermal energy that flows from a warmer material to a cooler material. > **__Specific Heat:__** Amount of thermal energy needed to raise the temperature of 1 kg of a material 1C.
 * **__Section 1__**

Conduction: The transfer of thermal energy by collisions between particles in matter. > Solar collector: Device used in an active solar heating system that absorbs radiant energy from the Sun. > **__Thermodynamics:__** Study of the relationship between thermal energy, heat, and work. > **__First law of thermodynamics:__** States that the increase in thermal energy of a system equals the work done on the system plus the heat added to the system. > **__Second law of thermodynamics:__** States that is impossible for heat to flow from a cool object to a warmer object unless work is done. > **__Heat engine:__** Device that converts thermal energy into work. > **__Internal combustion engine:__** Heat engine that burns fuel inside the engine in chambers or cylinders.
 * **__Section 2__**
 * __Convection:__** Transfer of thermal energy in a fluid by the movement of warmer and cooler fluid from one place to another.
 * __Radiation:__** Transfer of thermal energy by electromagnetic waves.
 * __Insulator:__** Material in which heat flows slowly.
 * Section 3