why do people sprinkle water on the open ground in front of their homes during summer
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People sprinkle water on the open ground in front of their houses during summer because when water is sprinkled on a hot surface, it gets evaporated very quickly. As evaporated water leaves the surface cool due to the large latent heat of vapourisation of water, this technique is quite effective in summers for cooling the surface.
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It is because the ground will be hot in summer. While sprikling some water, it will evaporate. During evaporation the water takes the heat around it making it cooler in the surrounding. The same method is used when it is hot on the roof.
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