When we in the United States say a car’s tire is filled “to

32 lb,” we mean that its internal pressure is 32 lbf/in2 above

the ambient atmosphere. If the tire is at sea level, has a

volume of 3.0 ft3, and is at 758F, estimate the total weight

of air, in lbf, inside the tire.

Calculando a densidade do ar

Aqui, é a constante específica dos gases e a temperatura é

Substituindo valores

Calculando a massa do ar:

Calculando a massa total do ar dentro do pneu

Substituindo valores