CONCOA Precision Gas Controls

Helium (He)
DESCRIPTION (Helium):


Helium is a colorless, odorless, tasteless gas with an extremely low density. It is usually shipped as a gas. Cylinder pressures are approximately 2200 psig @ 70° F. Typical uses include as a shielding gas for arc welding, fill gas for neon signs, fill gas for all types of balloons, leak detection and as a breathing gas for diving.

PHYSICAL CONSTANTS (Helium):

Molecular Weight: 4.0026
Specific Volume @ 70° F., 1 atm.: 96.6 cu.ft/lb
Boiling Point @ 1.0 atm. : -452 ° F
Melting Point @ 25.27 atm. : -457.62 ° F
Triple Point @ 0.051 atm: -455.6 ° F
Specific Gravity, Gas @ 32° F., 1 atm. (Air = 1): 0.137
Density, Gas @ b.p..: 0.0164 g/ml
Density, Liquid @ b.p..: 0.1248 g/ml
Critical Temperature: -450.2 ° F
Critical Pressure: 33.22 psia
Critical Density: 0.0693 g/ml
Latent Heat of Vaporization @ b.p.: 19.4 cal/mol
Latent Heat of Fusion @ t.p.: 23.04 cal/g
Specific Heat, Liquid @ 4° K: 3.45 cal/(mol)(° K)
Specific Heat, Gas @ 25° C., 1 atm. Cp: 4.9680 cal/(mol)(° K)
Specific Heat Ratio, Gas Cp/Cv: 1.63
Thermal Conductivity, Gas @ 0° C. : 3.39 x 10-3 cal/(sec)(cm2 )(° C/cm)
Dielectric Constant, Gas @ 67.3 ° F.: 1.000065
Dielectric Constant, Liquid @ 452.1 ° F. 1.0000969
Viscosity, Gas @ 60° F., 1 atm. : 0.0196 centipoise
Entropy, Gas @ 25° C., 1 atm. : 48.004 cal/mol ° C
Solubility in Water @ 20° C., 1 atm. 0.0086 ml/g H2O

CYLINDER CONNECTIONS (Helium):

Standard CGA V-1 Cylinder Connection up to 3000 psig threaded: CGA 580
Standard CGA V-1 Cylinder Connection up to 3000 psig yoke: CGA 930
Standard CGA V-1 Cylinder Connection 3001 - 5500 psig: CGA 680
Standard CGA V-1 Cylinder Connection 5501 - 7500 psig: CGA 677
Standard CGA V-1 Cylinder Connection Ultra High Integrity: CGA 718