1. Determine the diameter of the glass tube necessary to keep the capillary-height change of water at 30 C less than 1 mm. 2. On a certain day the barometric pressure at sea level is 30.1 in. Hg, and...

1. Determine the diameter of the glass tube necessary to keep the capillary-height change of water at 30C less than 1 mm.

2. On a certain day the barometric pressure at sea level is 30.1 in. Hg, and the temperature is 70F. The pressure gage in an airplane in flight indicates a pressure of 10.6 psia, and the temperature gage shows the air temperature to be 46F. Estimate as accurately as possible the altitude of the airplane above sea level.