HomePhysicalWhy is the fan running or manual fan feeling cool?

Why is the fan running or manual fan feeling cool?

Why is the fan running or manual fan feeling cool?

When we feel very hot in the room in the summer, we often turn on the fan or hold the fan. Then we feel a little cool. Are the fans and fans that fan the air? Not. We can, through an experiment to prove it. Place the thermometer in front of the fan and then turn on the fan. What do you see?
The temperature that the mercury column on the thermometer indicates does not change. Take a wet cotton ball over the outside of the thermometer’s mercury bulb, then place it in front of the fan and turn on the fan. Now we see, the temperature that the mercury column on the thermometer indicates drops significantly. It turned out that the fan could not cool the mercury bulb; it only blew out the wind, could quickly make the wet cotton water evaporate quickly; the evaporation carries heat in the mercury bulb, so The mercury column immediately lowered.
Based on the small experiment above, we can understand the principle that explains why people feel a little cool when turning on the fan. On hot summer days, the outside temperature is usually higher than the body temperature; the body’s heat is difficult to spread out.

fan photo
The human body then uses the sweat method to regulate body temperature because the evaporation of sweat can bring the body’s heat with it. Running a fan is to promote the air around the moving person’s body, but the movement of the air is an effective way to accelerate the evaporation of sweat. The faster the sweat evaporates, the easier it is for the body’s heat to be carried away, so the person feels cool.
On hot days without wind, sometimes the air temperature is not very high, but people feel frustrated. Sometimes, although the air temperature is relatively high, the weather is dry and windy, otherwise, we feel comfortable. The reason for this is the degree of evaporation of sweat and the spread of fast, slow body heat.


James Smith
I used to look up at the sky when I was a child and wonder what's in those stars. Growing up, when I had the opportunity to contact the source of human knowledge, I had more knowledge about the universe, the natural world, and created laws. Being the founder of Wikiwap is where I can share my understanding of the world around me in a simple way that readers can access knowledge like a child. You and I are parts of the world; life will always be beautiful.


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