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In this video a cooler, often referred to as an air conditioner or air cooling system, is a device designed to lower the temperature of a specific space or area, typically indoors. It operates on the principles of thermodynamics and uses a combination of mechanical and refrigeration processes to remove heat from the air and circulate cool air into the desired space.

Inside the cooler, there is a water reservoir or a water distribution system. Water is pumped or supplied to a cooling pad or evaporative media. This pad is typically made of cellulose or similar materials designed to hold water.

As warm air is drawn through the wet cooling pad, the water evaporates into the air. This evaporation process absorbs heat energy from the incoming air, which lowers its temperature.
A powerful fan is used to circulate the now cooler air from the cooling pad into the room or space, creating a flow of fresh, cool air.