What does bar mean when displayed on a car?

[LaHarley]

When a car displays bar, it indicates that the tire pressure is either too high or too low. The normal tire pressure value ranges from 2.3 to 2.8 bar. In winter, it can be appropriately increased by 0.1 bar, and in summer, it can be reduced by 0.2 bar to prevent tire blowouts. The hazards of excessive tire pressure include: 1. Reduced friction and adhesion of the tire, affecting braking performance; 2. Decreased resistance to punctures, increasing the risk of tire blowouts; 3. Accelerated wear of the central tread pattern, shortening tire lifespan and affecting the longevity of other components; 4. Excessive stretching and deformation of tire cords, reducing tire elasticity and increasing the load on the car during driving, leading to decreased puncture resistance; 5. Increased susceptibility to punctures from sharp objects like nails and glass on the road, which can cause internal cracks and blowouts upon impact.