What is the partial pressure, in atmospheres, of O2 in the air outside an airliner cruising at an altitude of 10 km, where the atmospheric pressure is 190 mmHg? How much must the outside air be compressed to produce a cabin pressure in which PO2 = 0.200 atm?

An engineer designing a new type of engine needs a liquid that can be heated and cooled quickly with as little exchange of energy as possible. which property should the engineer primarily look for in the liquid? a. low thermal conductivity b. low specific heat capacity c. high reactivity d. high internal energy e. high density