What does nitrogen mean for cars?
1 Answers
Generally speaking, nitrogen is used in car tires because it is an inert gas. Improving tire stability and comfort: Nitrogen is almost an inert diatomic gas, chemically very inactive. Its gas molecules are larger than oxygen molecules, making it less prone to thermal expansion and contraction, with smaller deformation amplitudes. It permeates through the tire walls about 30-40% slower than air, helping to maintain stable tire pressure, improve driving stability, and ensure driving comfort. Nitrogen also has low audio conductivity, effectively reducing tire noise and enhancing driving quietness. Preventing tire blowouts and under-inflation running: Compared to ordinary high-pressure air, high-purity nitrogen is oxygen-free and almost devoid of water and oil, with a low thermal expansion coefficient and low thermal conductivity, leading to slower temperature rise. This significantly reduces the speed of heat accumulation in tires, greatly lowering the probability of blowouts. Extending tire lifespan: Using nitrogen can significantly reduce the likelihood of irregular tire wear, thereby extending tire life. Nitrogen separation devices can maximally remove oxygen, sulfur, oil, water, and other impurities from the air, effectively reducing the oxidation level of the tire's inner liner and the corrosion of rubber, further prolonging tire life. Notes on nitrogen filling: Before filling with nitrogen, it's necessary to vacuum out the original air from the tire, though it's usually impossible to achieve a 100% vacuum, leaving a minimal amount of oxygen residue (1-2%). Additionally, some vehicles (such as trucks, vans, etc., and larger vehicles) require higher pressure for tire inflation, and the oxygen content in these tires needs to be reduced to about 2-3% to achieve a balance between internal and external partial pressures. Considering these practical situations, it's concluded that the nitrogen purity required for tire filling should be 95-98%.
