How to keep cool this summer: explained with Physics?

Summer season is characterized with hot temperature. It is a period of the year the environment becomes hotter than it used to be. This is because during this season, the intensity of sun’s ray reaching the earth is usually very high and more focused as a result of the rotating nature of the earth which makes it tilt while rotating.

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Excessive solar radiations increase atmospheric surface temperature and the heat content of the earth’s surface. When heat energy from the sun is focused on a surface, the surface absorbs the energy and the surface temperature is raised. Increase in temperature increases heat stress due to increased rate of metabolic activities in the body. Just to mention but a few, in order to stay cool in summer, minimize wearing of thick/black clothes.

Blackbodies absorb more heat than they emit, hence increasing the heat content of their user and makes them uncomfortable. Also minimize intake of hot drinks/foods and hot bathe as these increase the entropy of the body system. Both enthalpy (a body’s heat content) and entropy (extent of instability in a body or system) are temperature related. Human bodies emit heat more during summer and the collective emissions from individuals in a poorly ventilated environment cause rise in room temperature and consequently, body discomfort. So, avoid long stay in an overcrowded places during summer. Use of air conditioner is advised.

The air conditioner absorbs heated air within the room and transfers it outside through its cooling system leaving the room cool.