Composition of Air

2007-03-22
COMPOSITION % by volume
N2 Nitrogen 78.03
O2 Oxygen 20.99
A Argon 0.94
CO2 Carbon dioxide 0.03
H2 Hydrogen 0.01
others parts per million
Ne Neon 0.001230
He Helium 0.000400
Kr Krypton 0.000050
Xe Xenon 0.000006
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Ventilation Grille Sizing

2005-03-30

The aspect ratio is

Length
______   of the grille.
Breadth

(Total volume flow rate [m3 . s-1]).(100)
______________________________________________= Area (m2)
(No. inlets).( inlet velocity [m . s-1]).( per cent free area)


Fluids Constants

2005-03-24

This is a technical reference post that simply lists all the physical constants used in fluid calculations. Read the rest of this entry »