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Chapter 17: Problem 3

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

Short Answer

Expert verified
Tire pressure should be checked when the tires are cold because the heat from driving increases the air pressure inside the tires. This can lead to misleadingly high pressure readings. To get an accurate reading, tires should be 'at rest' for a few hours in cool temperature conditions.

Step by step solution

01

Understand the behavior of gases

Gases, like air, expand when heated and contract when cooled. This is explained by Charles Law, which states that the volume of a gas is directly proportional to its absolute temperature, assuming that pressure is constant. This means that as temperature increases, the gas expands and as it decreases, the gas contracts.
02

Relate gas behavior to tire pressure

When a tire is in use, due to friction and motion, it heats up. As the air in the tire heats up, it expands, causing the pressure inside the tire to increase. This is why after a long drive, tires are often 'harder' due to increased pressure.
03

Understand the importance of accurate tire pressure measurements

Maintaining the correct tire pressure is vital for both the performance of the vehicle and the safety of the passengers. A wrongly inflated tire affects the vehicle's handling, fuel efficiency, and tire lifespan. Hence, an accurate measurement is required.
04

Relate the temperature condition to tire pressure checking

To measure the tire pressure accurately, it must be checked when the tire is cold, as this is when the air inside the tire is at its 'resting' state and the reading would be most accurate. If it is checked when warm or hot, the reading may be artificially high due to the increased pressure from the heated air. After it cools down, the tire may be under-inflated, which can lead to a variety of problems, including increased tire wear and reduced fuel efficiency.

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