Principle of checking the cooling state of the tire when using an inflator

Checking the cooling state of the tire when using an inflator is a key step to ensure accurate measurement and inflation. Its principle is mainly related to the characteristics of thermal expansion of gas and tire pressure change.
During the driving process, the tire generates heat due to friction, compression and environmental influences. This heat causes the temperature of the air inside the tire to rise, which causes the gas to expand and the air pressure to increase. According to the gas state equation, the pressure of the gas is proportional to the temperature. That is, when the temperature rises, the activity of gas molecules increases, causing the air pressure to rise. If the air pressure is measured when the tire has not cooled down, the reading obtained will be higher than the actual required safety pressure. This incorrect measurement may cause the driver to underestimate the tire pressure or fill too much air when inflating, increasing the risk of a blowout.
Ideally, the tire pressure should be measured when it is cooled down. It is usually recommended to check after parking for 3 hours or measure when the vehicle has traveled less than 1 kilometer. At this time, the gas in the tire is at a relatively stable temperature and the reading is closer to the standard pressure recommended by the manufacturer. When measuring, it is usually recommended to adjust the tire pressure to the manufacturer's recommended range, which can usually be found on the driver's door frame, fuel tank cap or vehicle owner's manual.
The tire cooling status is also related to the external ambient temperature. In cold weather, the tire pressure will be relatively low, while in hot summer, the pressure may be higher. In different seasons and climate conditions, drivers need to pay special attention to the measurement time and tire temperature.