Convection is heat transfer or flow

Convection Convection is the movement or flow of heat in a substance that is accompanied by displacement of the particles of the substance. Convection occurs because of differences in the density of the substance . You can understand convection events , among others :
1 ) In the liquid due to differences in the density of a substance , eg water heating systems , hot water flow system .
2 ) In a gas substance due to differences in air pressure , such as the sea breeze and land breeze , air ventilation system , to get the cooler air in the room mounted air conditioner or fan , and factory chimneys .
The sea breeze and onshore wind are examples of natural events involving convection currents in the gas substances . Do you know how the sea breeze and onshore wind ? During the day the land heat faster than the oceans . This resulted in a hot air will rise and the land is filled by cold air from the sea surface , resulting in the movement of air from the ocean toward land commonly called the sea breeze . Sea breezes occur during the day , commonly used by traditional fishermen to return to the mainland . How onshore winds occur ?
At night the land is colder than the ocean faster . This resulted in hot air at sea level will rise and the place is filled by cold air from the mainland , resulting in the movement of air from land to the sea which is called onshore wind . Onshore winds occur at night , usually used by traditional fishermen to go to sea for fishing .

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