A syringe at a temperature of 20 °C is filled with liquid ether in such a way that there is no space

A syringe at a temperature of 20 °C is filled with liquid
ether in such a way that there is no space for any vapor. If the temperature is
kept constant and the plunger is withdrawn to create a volume that can be
occupied by vapor, what would be the approximate pressure of the vapor
produced?

Q18;

Explain the following observations:

(a) It takes longer to cook an egg in Ft. Davis, Texas
(altitude, 5000 feet above sea level) than it does in Boston (at

sea level).

(b) Perspiring is a mechanism for cooling the body.