(T vs V) In the winter, it's colder. When air inside the tires gets colder, it shrinks, so the tires seem flat, even though they haven't lost any air. Explain why a can of soda pop explodes if left in the hot sun.
That's because driving around heats up tires.
Charles' law states that the gas should occupy more space when heated, but a tire does not expand very much.
This causes the tire pressure to be higher when warm.
Here are several examples of situations in which Charles' Law is at play: If you take a basketball outside on a cold day, the ball shrinks a bit as the temperature is decreased. This is also the case with any inflated object and explains why it's a good idea to check your car's tire pressure when the temperature drops.
Learn more about Charle's law here: