166. The air in an automobile tire with a volume of 0.53 ft3

is at 90°F and 20 psig. Determine the

amount of air that must be added to raise the pressure to the recommended value of 30 psig.

Assume the atmospheric pressure to be 14.7 psia and the temperature and the volume to

remain constant.

A. 0.026 lb B. 0.046 lb

C. 0.066 lb D. 0.086 lb