Charles’s Law….Expansion of Gases
Under equal pressure all gases expand at the same rate. A gas expands by the same proportion as the temperature rises, provided external pressure remains the same.
How does this relate to tire pressure warning lights? Simply put, as a tire warms up, the air pressure in the tire increases. As the tire cools, the air pressure in the tire decreases. See below for examples.
This little tid-bit of information explains why, on cold mornings, your tire pressure warning light may turn on. Yes, it is that simple; as the temperature of a tire changes so does tire pressure. [Read more...]