Which gas has the highest partical pressure in atmosphere?

Which gas has the highest partial pressure in atmosphere?

Which gas has the highest partial pressure in atmosphere :

Which gas has higher partial pressure in tissues ?

Which gas has higher partial pressure in tissues ?

Which has the highest freezing poiont at one atmosphere

Which noble gas has the highest ionisation energy ?

The pressure of a gas at -173^(@) C is 1 atmosphere. Keeping the volume constant, to what temperature should the gas be heated so that its pressure becomes 2 atmosphere?