what is air

What is dead space air ?

(a) what is density of air at NTP? (b) what is the unit of relative density?

A tyre filled with air, (27^(@)C ,o and 2 atm ) bursts, then what is temperature of air (lambda=1.5)

Logically, what does a continually rising air pressure indicate?

What is Brewster angle for air to glass transtion ? ( mu of glass is 1.5 )

The heated air inside a hot air balloon weighs 5000 N. If the balloon supports a weight of 2000 N, what is the wieght of air displaced by the balloon?

What is the speed of light in air ?