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Evaporation is a cooling process. Dogs dont have sweat glands like us. They pant because saliva evaporates and cools them down. Evaporation of saliva gives feeling of coolness during hot summer days when they pant.
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Evaporation is a process by which it absorbs energy from the atmosphere and convert liquid into gaseious state below its boiling points.Since, it abosorbs energy from the surrounding, it causes a cooling effect.
The panting of dogs is based on this concept.While they pant, the water evaporates off their tongue and causes a cooling effect This gives a relief to them.
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