IDEAL GAS = EM RADIATION !!!


THEORY :
James Clerk Maxwell, in 1861–64, published his theory of electromagnetic fields and radiation, which shows that light has momentum and thus can exert pressure on objects.

SI units :
ENERGY/SPACE = [ Joul / cubic meters = Newton *meter / cubic meters = N/m^2 ]



LIGHT = many many very small bals !
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http://2.bp.blogspot.com/-jLcE4uLr5bQ/Vdomv2HebwI/AAAAAAAACd8/lLxGwW8n_bM/s1600/ball.jpg[/img]


WE MUST USE IDEAL GAS TO DESCRIBE MANY FACTS IN UNIVERSE !!!