Heat
Look at these Pictures and Discuss:
Let's discuss the questions:
* Why does the pump heat up when you fill a bicycle tube with air?
* When 500 milliliters of water and 1 liter of water are heated equally, which will heat up faster?
* Why is it that if a tight lid is difficult to open, it can be easily opened by heating it for a while?
* Why is it easier to drive an iron nail into wood after heating it?
Heat and Thermal Energy
(Heat and Thermal energy)
* Molecules are made up of compounds and potential energy is stored in molecules.
* When an object is heated, its molecules begin to vibrate.
* The vibration of molecules generates kinetic energy. It is from the kinetic energy of these molecules that heat is generated.
* As the temperature increases, the molecules vibrate faster, and as the temperature decreases, the molecules vibrate slower.
* The sum of the kinetic energy of the molecules in an object is called the heat or thermal energy of that object.
* A form of heat energy
* Calorimeter, a device for measuring heat
* Heat is measured in units of joules or calories.
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