The reason: if there is cotton clothing on the human body, and the weather is dry, the skin and the clothing will rub against each other when the person is active, and the atoms on the clothing will lose electrons, so the internal and external charges of the nucleus are unbalanced, which shows electricity. sex. However, because the surrounding humidity (concentration of water vapor) is higher than that in winter, the generated electric charge will be taken away by the water vapor in time or contact with the ground through the skin, which will lead to the ground.

In winter, the weather is dry and the skin is dry, and the electric charge generated on the body cannot be taken away in time. The accumulation of more and more will reach the XX electron volts mentioned above. Then, these electric charges will move to the higher surface of the clothes and concentrate. (For example, the thread on the clothes or the erected cotton, the lightning rod is based on this principle.), once it encounters a charge opposite to them, it will discharge, and the strong current can remove nitrogen or other elements in the air. When the elements are intensified, electric sparks are produced, which is the so-called fluorescent discharge, which is the same principle as thunder and fluorescent lamps.