dielectric of air

According to my Radio Engineers Handbook, as published in 1970, air is a perfect dielectric as utilized for air gap capacitors used to tune various radio frequency circuits, however, the presence of water in the gap will affect the dielectric constant, for the effect of temperature, refer to Boyles law relating to the expansion of a gas from temp. changes. The dielectric constant of air increases with pressure imcreases, conversely, decreases with temp. increases. Good Luck

I looked up Charle's law relating to volume of gasses, and the volume is proportional to the temperature , expressed in degrees Kelvin, Celsius plus 273 and is a constant, so just set up a proportion between the volume at T1 and the volume at T2 to solve the prob.