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3 Types of Heat Transfer

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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3 Types of Heat Transfer

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  1. 3 Types of Heat Transfer

  2. Heat Transfer- • The movement of heat from a warmer object to a cooler object.

  3. 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.

  4. conduction

  5. 2. Convection • Heat transfer by means of up and down movements called convection currents. • Can occur only in a liquid or a gas

  6. 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.

  7. 3. Radiation • Heat transfer through open space. • Occurs in a gas only.

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