Very often, novice car enthusiasts are perplexed, why with the onset of cold weather the tire pressure decreases slightly. Immediately it is worth making a reservation - this is not at all a reason to contact a car service or to look for the cause of the problem yourself, since there is only one reason: the air in the wheel reacted to a decrease in temperature.
Instructions
Step 1
Remember the well-known law of physics, which says that all gases expand when heated, and when cooled, on the contrary, contract. It is quite natural that a tire inflated in the summer, for example, up to two bar, will not show such pressure at sub-zero temperatures. It will be much less, and in this case it is not worth pumping up the tires.
Step 2
Experienced drivers recommend inflating the tires in a warm room to the required pressure based on the dimensions and axle loads. After that, roll the inflated wheel out into the street, hold it in the cold and then measure the pressure. To get the result you want, you must consider the heat that the wheels inevitably experience when driving, even in winter.
Without exception, all manufacturers indicate in the data sheet the optimal tire pressure, provided that the car is in the garage at room temperature. If after a trip you suddenly find that the tire pressure has increased by 10%, then know that this is absolutely normal and does not need to be lowered. After 2-3 hours, the tires will cool down and the pressure will return to normal. But if these readings are significantly lower, then the wheel should be checked for damage.
Step 3
Check the tire pressure at least twice a month. Given the high dependence of compressed air on the outside temperature, more and more drivers prefer to pump the wheels of their cars with nitrogen. Its thermal expansion coefficient is 7 times lower than that of oxygen, which is part of the air, therefore, the pressure in a tire filled with nitrogen, after "road" heating, will increase by only 0.1 atm. This is especially important in summer, when excessive heating of the wheel can lead to its "explosion". Another advantage of nitrogen is less fluidity compared to conventional compressed air. Even in the event of a puncture, such a wheel “deflects” much more slowly, which increases the vehicle's range.
