How can you calculate density from : altitude temperature and absolute humidity
The easiest way is to use a standard atmospheric table like the one here:
If you want to get down and dirty with density calculations, look around for NIST's publication NBSIR 77-1278 The Air Density Equation and the Transfer of the Mass Unit.
from humidity u can find due point
due point and temp u can find pressure
if the fluid is ideal u can find volume by PV=nRT
if u know pressure and temp u can find spc. volume
from spc.volume and volume u can find mass
from mass and volume u can find density...
If you know specific volume, you know the density.
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