What does bar mean in cars?
1 Answers
In cars, bar is a unit of pressure measurement, specifically megapascal, which refers to atmospheric pressure, commonly abbreviated as air pressure. According to the international GBT2978-2008 standard, the appropriate tire pressure for cars is as follows: 1. Standard tires should have a pressure of 2.4-2.5 bar. 2. Reinforced tires should have a pressure of 2.8-2.9 bar. 3. The maximum tire pressure should not exceed 3.5 bar. Insufficient air pressure can increase tire deformation, leading to cracks on the tire sidewalls and causing flexing movements, which generate excessive heat, accelerate rubber aging, fatigue the cord layers, and break the cords. It also increases the tire's contact area with the ground, speeding up shoulder wear. Excessive air pressure, on the other hand, overstretches the tire cords, reducing the tire's elasticity and increasing the load on the car while driving. In case of impact, it may cause internal cracks or even blowouts. Additionally, high pressure accelerates tread wear and reduces puncture resistance.