Thermal Energy

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Thermal Energy by Mind Map: Thermal Energy

1. Definition : Heat Travelling from a place of higher temperature to a region of lower temperature

2. Conuction

2.1. Process by which heat is transmitted through a medium from one particle to another

2.2. Types of conduction

2.2.1. Conduction in Non-Metals

2.2.1.1. Conducts heat by particles colliding with each other and transferring energy

2.2.2. Conduction in Metals

2.2.2.1. Transfers heat by free electrons

2.2.2.2. Conducts heat by particles colliding with each other and transferring energy

3. Convection

3.1. Transfer of Thermal energy by means of currents in a fluid

3.2. Examples

3.2.1. Liquid

3.2.2. Gas

3.3. Uses the property of density change

3.3.1. Hot air rises

3.3.1.1. Density lower

3.3.2. Cold air sinks

3.3.2.1. Density higher

4. Radiation

4.1. Continual emission of infrared waves from the surface of all bodies transmitted without the aid of a medium

4.2. Hotter the object emits higher amount of radiant heat

4.3. Factors affecting rate of radistion

4.3.1. Surface temperature

4.3.1.1. Higher temperature of surfaces means higher rate of infrared radiation

4.3.2. Colour and texture of surface

4.3.2.1. Dull and black

4.3.2.1.1. Good absorber

4.3.2.1.2. Good emitter

4.3.2.2. White and shiny

4.3.2.2.1. Poor Absorber

4.3.2.2.2. Poor Emitter

4.3.2.2.3. Can be used to reduce heat being absorb in a house and to reduce heat being emitted to keep things cool

4.3.3. Surface area

4.3.3.1. Larger Surface area emits radiant heat at higher rate