At a certain altitude, the density of air is 1/10th of the density of the earth’s atmosphere and temperature is –10°C. What is the pressure at that altitude? Assume that air behaves like an ideal gas, has uniform composition and is at S.T.P. at the earth’s surface.

At a certain altitude, the density of air is 1/10th of the density of

1.	At a certain altitude, the density of air is 1/10th of the density of the earth’s atmosphere and temperature is –10°C. What is the pressure at that altitude? Assume that air behaves like an ideal gas, has uniform composition and is at S.T.P. at the earth’s surface.
Answer» The density of air is 1/10th of the density of earth's atmosphere and its TEMPERATURE is -10°C.Consider the air BEHAVES as an IDEAL gas and it has UNIFORM composition at STP at surface of the earth.Then and Hence, = ATMOSPHERIC pressure = 760 mm HgThe pressure at the altitude is 73.2 mm