Appendix

The material contained in this appendix is for clarification and general information only.

Physical Properties of Ammonia

Molecular symbol   NH 3

Molecular weight   17.031

Boiling point at one atmosphere*   -28 ° F

Melting point one atmosphere*   -107.9 ° F

Critical temperature   271.4 ° F

Critical pressure   1657 psia

Latent heat at -28 ° F and one atmosphere*   589.3 Btu/lb

Relative density of vapor compared to dry air at 32 ° F and one atmosphere*   0.5970

Vapor density at -28 ° F and one atmosphere*   0.05555 lb/ft 3

Specific gravity of liquid at -28 ° F compared to water at 39.2 °F   0.6819

Weight per gallon of liquid at -28 ° F   5.69 lbs/gallon

Liquid density at -28 ° F and one atmosphere   42.57 lbs/ft 3

Specific volume of vapor at 32 ° F and one atmosphere   20.78 ft 3 /lb

Flammable limits by volume in air at atmospheric pressure   16% to 25%

Ignition Temperature (in a standard quartz container)   1562 ° F

Specific Heat, Gas, at 59 ° F and one atmosphere*

  at constant pressure, C p   0.5232 Btu/lb ° F

  at constant volume, C v   0.3995 Btu/lb ° F

*One atmosphere = 14.7 psia