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3 Types of Heat Transfer. Heat Transfer-. The movement of heat from a warmer object to a cooler object. 1. Conduction. Heat transfer by direct contact of molecules. In other words, when one molecule runs into another and it runs into another, etc. It can occur in a solid, liquid or a gas.
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Heat Transfer- • The movement of heat from a warmer object to a cooler object.
1. Conduction • Heat transfer by direct contact of molecules. • In other words, when one molecule runs into another and it runs into another, etc. • It can occur in a solid, liquid or a gas. • Occurs best in a solid because the molecules are close together.
2. Convection • Heat transfer by means of up and down movements called convection currents. • Can occur only in a liquid or a gas
Convection currents • Heated molecules do 2 things: 1. they expand, become less and then.. 2. they rise. Cooled molecules do the exact opposite: 1. they contract, become more dense and then… 2. they sink That is what makes a hot air balloon rise.
3. Radiation • Heat transfer through open space. • Occurs in a gas only.
