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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
Checking tire pressure when it's cold is recommended because temperature affects air pressure. After tires have been used, they and consequently, the air inside, heat up, which makes the air pressure seem higher than it actually is. To ensure an accurate measure, it's important to check the pressure after the tires have cooled down.

Step by step solution

01

Understanding the Problem

In this question, we are looking at the reason for checking tire pressure when the tires are cold. This involves understanding the relationship between temperature and air pressure, and how that affects a tire.
02

Connection Between Temperature and Air Pressure

According to the ideal gas law, when the temperature of a gas increases, so too does its pressure if the volume is kept constant. This is because the gas molecules move more quickly and collide with the walls of their container (in this case, the tire) more frequently and with more force.
03

Applying the Concept to Tires

After driving, the tires get hot due to friction between the tires and road surface. Therefore, the air inside the tire also heats up, which consequentially increases the air pressure inside the tire. This isn't a true representation of the tire's resting pressure as it's influenced by the external condition (driving).
04

Importance of Checking Tire Pressure When Cold

To get an accurate measure of tire pressure, we should check it when the tires are cold, i.e., haven't been recently used. This ensures that the reading isn't artificially high due to the increased temperature since the tire and the air inside have had enough time to cool and the air pressure to stabilize. This is why tire manufacturer's provide a 'cold' inflation pressure that should be used as the standard for inflating tires.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Temperature and Pressure Relationship
The connection between temperature and pressure is explained by the ideal gas law. This scientific principle helps us understand why your tire pressure reading might vary depending on temperature conditions. According to the ideal gas law, when a gas is kept at a constant volume, its pressure scales with its temperature. This is because as temperature rises, gas molecules move faster, hitting the walls of their container more often and with more force. In the context of a tire, this means as the air inside heats up while you drive, there is a notable increase in pressure.
  • As the temperature of the gas inside a tire goes up, its pressure increases.
  • Conversely, as the temperature drops, so does the pressure.
  • This relationship is crucial for determining accurate tire pressure readings.
By understanding this relationship, drivers can better maintain their vehicle for safety and efficiency.
Tire Pressure Measurement
Regularly monitoring tire pressure is vital for your vehicle's safety and efficiency. Tire pressure measurement involves using a tire gauge to determine the amount of air pressure within a tire. Typically measured in pounds per square inch (PSI), this measure ensures that tires are not under- or over-inflated. Both conditions can affect the handling of the vehicle and the wear of the tires.
  • Under-inflated tires can lead to greater resistance on the road, increasing fuel consumption.
  • Over-inflation might reduce the tire's contact with the road, impacting grip and control.
  • Regular checks allow for adjustments according to the manufacturer's recommended PSI.
Checking tire pressure should become a standard practice for vehicle owners. It helps maximize tire lifespan and improve driving performance.
Cold Tire Inflation Pressure
Cold tire inflation pressure refers to the recommended pressure reading taken when tires haven't recently been driven, typically after the vehicle has rested for at least three hours. This is because driving conditions, like road friction, heat the tires and might give an inaccurately high reading.

Manufacturers often specify a 'cold' inflation pressure level in the vehicle handbook. Ensuring that tire pressure is checked when the tires are cold means you are not affected by temporary temperature changes due to recent driving. This leads to a more accurate measurement of the tire's resting pressure.
  • Check tire pressure first thing in the morning or after a long period without driving.
  • This allows any air temperature inside the tire to stabilize, providing a true reading.
  • Follow the car manufacturer鈥檚 recommendations for optimal tire pressure.
By adhering to these practices, you enhance the tire's durability and vehicle safety.

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Most popular questions from this chapter

Water's coefficient of volume expansion in the temperature range from \(0^{\circ} \mathrm{C}\) to about \(20^{\circ} \mathrm{C}\) is given approximately by \(\beta=a+b T+c T^{2},\) where \(T\) is in Celsius and \(a=-6.43 \times\) \(10^{-5} \circ C^{-1}\) \(b=1.70 \times 10^{-5} \cdot \mathrm{C}^{-2}\) and \(c=-2.02 \times 10^{-7} \mathrm{c}^{-3}\) Show that water has its greatest density at approximately \(4.0^{\circ} \mathrm{C}\)

A solar-heated house stores energy in 5.0 tons of Glauber salt \(\left(\mathrm{Na}_{2} \mathrm{SO}_{4} \cdot 10 \mathrm{H}_{2} \mathrm{O}\right),\) which melts at \(90^{\circ} \mathrm{F} .\) The heat of fusion of\ Glauber salt is 104 Btu/lb and the specific heats of the solid and liquid are, respectively, \(0.46 \mathrm{Btu} / \mathrm{lb} \cdot^{\circ} \mathrm{F}\) and \(0.68 \mathrm{Btu} / \mathrm{lb} \cdot^{\circ} \mathrm{F}\) After a week of sunny weather, the storage medium is all liquid at \(95^{\circ} \mathrm{F} .\) Then comes a cloudy period during which the house loses heat at an average of 20,000 Btu/h. (a) How long is it before the temperature of the storage medium drops below \(60^{\circ} \mathrm{F} ?\) (b) How much of this time is spent at \(90^{\circ} \mathrm{F} ?\)

If the volume of an ideal gas is increased, must the pressure drop proportionately? Explain.

How is it possible to have boiling water at a temperature other than \(100^{\circ} \mathrm{C} ?\)

Evaporation of sweat is the human body's cooling mechanism. At body temperature, it takes 2.4 MJ/kg to evaporate water. Marathon runners typically lose about 3 L of sweat each hour. How much energy gets lost to sweating during a 3 -hour marathon?
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