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Chapter 17: Problem 2

Why are you supposed to check tire pressure when your tires are cold?

Short Answer

Expert verified
The pressure inside a tire is to be checked when cold because driving heats up the tires and increases the air pressure inside them, which may give an inaccurate reading. Cold tires provide the most accurate tire pressure measurements.

Step by step solution

01

Understand the Context

Car tires are filled with air, and the pressure inside those tires is important because it affects how the car handles and the fuel efficiency. It's common knowledge that the tire pressure should be checked when the tires are cold, but why is that?
02

Effects of Heat

Heat causes things to expand, and this includes air. Therefore, when a car is driven around, the tires get hotter and the air inside them expands. This causes the tire pressure to rise, and if a measurement is taken while the tires are hot, it could give a false high reading.
03

Effects of Cold

Cold causes things to contract, so when the tires are allowed to cool, the air inside them contracts and returns to its normal volume and pressure. This provides a more accurate reading of the true tire pressure.
04

Importance of Correct Reading

If the tire pressure is misjudged because the tires are hot, it could lead to improper tire inflation. This could cause uneven tire wear, have negative impacts on the fuel efficiency, possibly damage the tires, and might make the vehicle less safe to drive.

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