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#
pV=nRT

or this: wiki.answers.com/Q/How_can_you_convert_air_mass_to_air_volume

i.e. 1.2 kg m^-3 at room temp and pressure
(I helped save b3ta! giant_squid, Mon 16 Feb 2009, 20:37, archived)
# many thanks
Photobucket
(I helped save b3ta! Sir T. Skellington, Mon 16 Feb 2009, 20:47, archived)