[PDF] helium gaz

Is helium a gas?

• Helium is an odorless, colorless, and tasteless gas. Helium, more than 99.9 percent pure, is also used in liquid form at -452 degrees Fahrenheit. Where does helium come from? Helium occurs with other gasses in pockets beneath the Earth's surface. The most economical source of helium is natural gas, all of which contains some helium.

What is a helium gas seal?

• A seal that has the capability to retain heli- um gas molecules is essential to entrap- ment. Helium gas molecules have a diam- eter of 0.2 nanometers (nm; 10-9meters; Hunt 1996). Molecular diameters for other common gases are 0.33 nm for CO2, 0.34 nm for N2, and 0.38 nm for CH4(Hunt 1996).

How big is a helium molecule?

• Helium gas molecules have a diam- eter of 0.2 nanometers (nm; 10-9meters; Hunt 1996). Molecular diameters for other common gases are 0.33 nm for CO2, 0.34 nm for N2, and 0.38 nm for CH4(Hunt 1996). Because of the smaller size of helium molecules, some seals that contain CO2, N2, and CH4may leak helium.

What is the UN number for helium?

• Transportation Information UN Number:1046 Shipping NameHelium,Helium, Helium, Compressed Compressed Compressed Hazard Class2.12.12.1 Label Nonflammable Nonflammable Nonflammable GasGasGas (M)SDS Reference P-4602 CAS Number 7440 - 59 - 7 General Description Colorless, odorless, nonflammable inert gas. United States of America CanadaMexico