Practical Applications of Convection of Heat

Practical Applications of Convection of Heat
Here we give a few applications of convection of heat.

(1) Ventilation

From health point of view every lining room of a building should be provided with ventilators near the ceiling. Due to respiration of the persons sitting or sleeping in the room the air in the room gets warmer and hence is less dense. It rises up and goes out side through the ventilator. Fresh air comes in the room through the doors and windows. Thus a convection current of air is maintain.

2. Trade Wings

At the equator the surface of the earth gets heated more than at the poles. This results in the movement of the warm air from the equator to the poles of the cold air moves towards the equator. Because of the rotation of the earth (from west to east) the air in the Northern Hemisphere seems to be coming from north-east instead from north. In the South Hemisphere the air from the south hole appear to be coming from south west. These winds are called trade winds because in olden days these winds were used by traders for sailing their ships.

3. Land and Sea Breezes

Land is a better conductor of heat than water. Hence in day-time the land gets hotter than water in the sea. The air above the land becomes warm and rises up being lighter and some what cold air above sea surface moves towards the sea short. This is known as seabreeze. Thus convection currents fair our set-up. During night land becomes cooler than water and so the warm air over the surface of water in. the sea rises up. The air on the land near the sea shore begins to move towards sea side and is called land breeze.