JSS2 Third Term Basic Science Lesson Note – Thermal Energy

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WEEK TWO

TOPIC: THERMAL ENERGY

SUB-TOPIC: Heat transfer

Meaning of heat transfer

Thermal energy or heat energy is a form of energy. It is a form of energy that flows from a hot area to a cold one. Heat flow is the flow of heat in an object like iron rod from the area of high temperature to area of low temperature through the medium. Hot body loses heat to a cooler one. Heat can be transferred by three processes: conduction, convection, and radiation.

Conduction: This is the process by which heat energy is transferred from region of high temperature of a body to a lower temperature body along a stationary solid material. it is this process that makes a pot on fire to transfer heat to the handle of a pot, even if only the tip is in the fireplace. This method of heat transfer requires a solid material medium.

Convection: transfers heat through the exchange of hot and cold molecules; this is the process through which water in a kettle becomes uniformly hot even though only the bottom of the kettle contacts the flame. The material medium for this process is liquid and gas only. This is way small amount of hot water can warm a full pocket of cold water.

Radiation: is the transfer of heat via

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