1. Temperature Rise: As the car moves, the tires flex and generate friction with the road surface, leading to an increase in the tire's temperature. This is especially true during long drives when the tires are continuously in contact with the road, generating more heat.
2. Expansion of Air: When air is heated, its molecules move faster and occupy more space, resulting in an increase in pressure. As the tire temperature rises, the air inside expands and exerts greater pressure on the tire's inner walls.
3. Reduced Air Volume: The expansion of air within the tire reduces the available volume for the same amount of air. With the same amount of air occupying less space, the pressure naturally increases.
4. Thermal Expansion of Tire: The tire itself undergoes thermal expansion as it heats up. This causes the tire's internal volume to decrease slightly, further contributing to the increase in air pressure inside.
5. Atmospheric Pressure Changes: Changes in atmospheric pressure can also affect tire pressure. If the atmospheric pressure decreases, such as when driving uphill or to a higher altitude, the pressure inside the tire may increase to balance out the external pressure changes.
Remember, the increase in tire pressure due to heating is usually temporary and will stabilize once the tire cools down. However, it's essential to avoid exceeding the recommended tire pressure specified by the vehicle manufacturer, as overinflation can lead to reduced traction and increased wear and tear on the tire and suspension components.
