What is convection ?
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There are three modes of heat transfer. Convection, conduction, and radiation. Convection and conduction need mediums to transfer heat from one place to another, but radiation doesn't need mediums. In the convection process, heat is transferred through air or liquid currents. Liquids and gases are pRead more
There are three modes of heat transfer. Convection, conduction, and radiation. Convection and conduction need mediums to transfer heat from one place to another, but radiation doesn’t need mediums. In the convection process, heat is transferred through air or liquid currents. Liquids and gases are poor conductors of heat. They are heated by the convection process. In convection, the transfer of heat is always vertically upward because the molecules of the medium near the source of heat, after absorbing heat, start moving faster. Medium starts expanding and less dense medium risses up and the denser medium moves down to take its place. Convection causes liquid or gas to heat up, expand, and decrease in density. This causes the liquid or gas to move in a convection current.
Some example of a convection mode is
1. Ventilation in a room. When cooler air comes into the room, it takes the place of hot air near the ground surface, and hot air’s lightweight goes up and escapes from the ventilator.
2. Sea breeze or a land breeze caused by a difference in pressure.
3. Ocean currents are caused due to convection currents inside the ocean.
4. Chimneys over the furnace in factories.
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