User:Akhila Mathew/sandbox

EVAPORATION Evaporation is a process of change in phase of a liquid to its vapor state below its boiling point. If we keep a beaker of water in sunlight, after some time we can observe that the amount of water has reduced. This is because of evaporation. The factors affecting evaporation are, Temperature Clothes dry faster in summer season than in winter season. Surface area Spreading helps clothes dry faster, since the surface area exposed to surrounding has increased. Humidity Clothes dry faster in a sunny day than in a rainy day. Wind speed The air around the wet clothes absorbs water. On a windy day, the humid air around the clothes gets removed frequently thus they dry faster. Evaporation is a surface phenomenon. If we take a beaker of water the molecules in bulk have force of attraction in all the directions whereas in the case of molecules there is only attraction from the molecules just below and sides of it. So a small amount of energy from the surrounding is enough for it to get vaporized, since it absorb energy from the surrounding there will be a cooling effect in the surrounding. This is the reason behind the cooling effect while sweating. The sweat takes heat energy from the body and vaporizes, hence the body feels cool.