Suppose you start your day in Denver, on a cool 10°C spring day. The local atmospheric pressure is 85 kPa. You fill your car’s tires until the gauge shows 210 kPa (about 30 psi). You then drive up to Fairplay, Colorado, where the atmospheric pressure is lower—70 kPa—and the temperature drops to 0°C.When you finish lunch, you check your tire pressure. What does the gauge read?

Suppose you start your day in Denver, on a cool 10°C spring day. The local atmospheric pressure is 85 kPa. You fill your car’s tires until the gauge shows 210 kPa (about 30 psi). You then drive up to Fairplay, Colorado, where the atmospheric pressure is lower—70 kPa—and the temperature drops to 0°C.When you finish lunch, you check your tire pressure. What does the gauge read?

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