[hotrod]

"...which is another way of saying you don't know the latent heat of evaporation for nitrous oxide"

No it means I didn't bother looking it up because the combustion effects would totally negate it.

Its about 1/6th the latent heat of vaporization of water. But if you used any where near enough to get the same cooling level the oxygen release in the cylinder would probably make your pistons catch fire literally.

The info is widely available in MSDS sheets.

Nitrous Oxide
Molecular Weight

* Molecular weight : 44.013 g/mol

Solid phase

* Melting point : -91 ?C
* Latent heat of fusion (1,013 bar, at triple point) : 148.53 kJ/kg

Liquid phase

* Liquid density (1.013 bar at boiling point) : 1222.8 kg/m3
* Liquid/gas equivalent (1.013 bar and 15 ?C (59 ?F)) : 662 vol/vol
* Boiling point (1.013 bar) : -88.5 ?C
* Latent heat of vaporization (1.013 bar at boiling point) : 376.14 kJ/kg
* Vapor pressure (at 20 ?C or 68 ?F) : 58.5 bar

Critical point

* Critical temperature : 36.4 ?C
* Critical pressure : 72.45 bar

Gaseous phase

* Gas density (1.013 bar at boiling point) : 3.16 kg/m3
* Gas density (1.013 bar and 15 ?C (59 ?F)) : 1.872 kg/m3
* Compressibility Factor (Z) (1.013 bar and 15 ?C (59 ?F)) : 0.9939
* Specific gravity (air = 1) (1.013 bar and 21 ?C (70 ?F)) : 1.53
* Specific volume (1.013 bar and 21 ?C (70 ?F)) : 0.543 m3/kg
* Heat capacity at constant pressure (Cp) (1.013 bar and 15 ?C (59 ?F)) : 0.038 kJ/(mol.K)
* Heat capacity at constant volume (Cv) (1.013 bar and 15 ?C (59 ?F)) : 0.029 kJ/(mol.K)
* Ratio of specific heats (Gamma:Cp/Cv) (1.013 bar and 15 ?C (59 ?F)) : 1.302256
* Viscosity (1.013 bar and 0 &degC (32 ?F)) : 0.000136 Poise
* Thermal conductivity (1.013 bar and 0 &degC (32 ?F)) : 14.57 mW/(m.K)

Miscellaneous

* Solubility in water (1.013 bar and 5 ?C (41 ?F)) : 1.14 vol/vol

Larry