The advantages and disadvantages of the gas in automobile tires
The purpose of filling the tires is not to do with the purity of the nitrogen, but to keep the amount of oxygen in the tire up to 2~5%, so that a small amount of oxygen in the tire can produce equal pressure with the outside world.
The purpose of tire charging is to make the partial pressure in the tire equal to the outside (inside and outside the tire pressure balance), so that a small amount of oxygen is stuck in the tire, and will not penetrate the tire wall, resulting in insufficient tire pressure.
The tyre needs to be evacuated before charging nitrogen, and the original air in the tire is pumped out, but it is usually unable to pump the 100% vacuum. There is still a very small amount of oxygen remaining (1 - 2%). Furthermore, some vehicles (such as trucks, vans)... And other large vehicles, the tire to fill the pressure is higher, the corresponding tire oxygen rate needs to be reduced to 2 - 3%, in order to achieve the tire internal and external pressure balance. Based on the above situation, the conclusion is that the nitrogen purity of tire nitrogen is 95 - 98%.In the Bridgestone professional sales network "car wings", recommended to the user to use nitrogen tire.
