Bottled nitrogen is often specified as dryer than 2 ppm (parts per million) equivalent to a dew point of -94°F (-70°C). The gas source for drying should always be validated before use. As a rule of thumb the gas must be at least 10°C lower than required purge dryness.
Molecular Weight: 28.01
Boiling Point: -319.9°F (-195.5°C ) at 14.7 psi (101.3 kPa)
Specific Volume: 13.72 ft.3 lbs.-1 (0.855 m3 kg-1 at 68°F (20°C), 14.7 psi (101.3 kPa)
Critical Temperature: -232.5°F (-146.95°C)
Critical Pressure: 493 psi (3,400 kPa)
Heat Capacity: 0.249 BTU lbs.-1 °F-1 (1,040 Jkg-1 K-1) at 77°F (25°C), 14.7 psi (101.3 kPa)