4. You are an auto mechanic working in a garage in the middle
of winter. A customer comes back complaining that you did not
inspect his car closely enough and believes that the tires are
leaking air. Upon questioning the customer, you find out that the
customer had to leave the car with the garage for several days,
where it was left in a heated room. The tires appeared fine to
the customer when he left, but shortly afterward, the tires
appeared to be flatter. You look the tires over and there does
not appear to be any holes where air could leak out. Having
completed this lab, what could you tell the customer to put his
mind at ease?