This page should have the answer to all the info you requested:
http://www.engineeringtoolbox.com/ai...rties-t_8.html
Specifically:
http://www.engineeringtoolbox.com/ai...ies-d_156.html
and
http://www.engineeringtoolbox.com/ga...tems-t_22.html
Not sure how you'd compensate for lower pressures.
Let me know if you need more.