Heat is the amount of energy contained in a substance. Its SI unit is Joule (J).
Temperature is the measurement of the degree of hotness or coldness of a particular object. Temperature can be measured by a thermometer and is measured in degree Celcius.
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| Heat and Temperature |
Conduction is the process of heat tranfer from a hot area to cold area throughout a solid.
Different solid conduct heat at different rates.
Substances which allow heat to flow quickly are called conductors while allow heat to flow slowly are called insulators.
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| Electrical Conductor |
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| Electrical Insulator |
Convection is the process of heat transfer in fluids as a result of the movement of the fluid from a hot area to a cooler area.
Radiation is the process of transfer of heat from a heat source to the surrounding without the presence of any medium.
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| Conduction, Convection, and Radiation |
Medium is a transmitting substance which allows heat to be transferred. For example, particles of solids and liquids.
The principle of heat transfer in everyday life can be through using kitchen utensils for cooking, air-conditioners, electric kettle, refrigerators and others.
The principle of heat transfer in nature can be seen in sea breezes, land breezes and the warming of the Earth by the Sun.
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| Sea Breeze |
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| Land Breeza |
Opaque and dull surfaces absorb and radiate heat more effectively than shiny surfaces.
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