Explain in 3 – 4 sentences (in your own words) how perspiration keep you cool on a hot day

Explanation:

Perspiration on the skin makes one cool because of evaporation. It requires thermal energy to convert the liquid into a gas. This thermal or heat energy has to come from somewhere. As it is on the skin, the simplest way to conduct heat is by the process of conduction, that is, from the skin to the fluid. The skin cools down, the liquid transforms into a gas, and floats in the air.  

Perspiration helps one to cool down in two ways. Initially, it makes the skin feel cooler when it is wet, and secondly, the generated heat gets removed by the process of evaporation.  

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in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.