Air is kept at a pressure of 300 KPa absolute and a temperature of 30 degrees Celsius in a 400 liter container. 1. What is the density of air if R = 280 N-m/kg-0K?

If the specific gravity of unknown fluid is 13.56, what is its specific weight in lbf/ft³?

A manometer containing two oils is used to assess the pressure of air in a storage tank.  Given the configuration of the oils in the picture, calculate the pressure in the tank.  The density of air is negligible to the density of the oils (?oil1 = 1000 ??/m3; ?oil2 = 400 ??/m3 ). The height of oil 1 is 1 ?, and the height of oil 2 is 0.8 ?.  The atmospheric pressure is 98 ???. The manometer is ipen to the atmosphere.

Consider a tall building. The air pressure at the bottom of the building is 101155Pa. The top of the building is 363m above. Assuming that the air density is constant at 1.225kg/m³, what is the percentage drop in pressure at the top of the building relative to the pressure at the bottom? Give your answer to 1 decimal place. Use the acceleration due to gravity of 9.81m/s².