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Please see that my actual question is not similar to this: Why do we feel cool when we turn our fans on?

Suppose I switched my fan on. The air particles start moving. Since, their kinetic energy increase, their temperature should so for some time . Since there temperature increases, then there should be a heat transfer from air surroundings to our body( because heat flows from hotter region to colder region) . Hence, we should always feel warm when we switch fan on.

Is evaporation the only cause for it? Then why do I feel warm when riding a bicycle in an open field in a hot summer day?

Qmechanic
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  • When you ride your bike you are creating heat in your body by pedaling and this counteracts the cooling by evaporation. If you glide down a long hill, the breeze would have a cooling effect, no? – Not_Einstein Apr 14 '22 at 14:51
  • while riding bike, I believe that I feel warm due to air only. it feels like 'hot' particles are colliding my face. –  Apr 14 '22 at 15:31
  • You are forgetting that your body also has a temperature and that temperature is almost always warmer than the air. The random velocities that result in net zero movement which we typically associate with temperature are much faster and therefore of much higher kinetic energy than those that result in net movement like wind unless you are supersonic jet. The energy contributed from the motion of a regular breeze is negligible in comparison to that of the temperature. You might be interested in this: https://physics.stackexchange.com/questions/675754/what-is-cold-wind/675760#675760 – DKNguyen Apr 14 '22 at 17:56

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