Helium - (He)

The second-lightest element (hydrogen being the lightest) has a gaseous specific gravity of 0.138. It’s a colorless, odorless, tasteless inert gas at room temperature and atmospheric pressure. Its boiling point is –452.1°F (268.9°C) at atmospheric pressure.

Helium is present in dry air at a concentration of 0.0005%. Its principal source is a natural gas well where the helium is extracted from the crude natural gas stream and purified. Helium can be stored and shipped either as a gas or cryogenic liquid.

Helium is widely used as an inert gas in the arc welding process. And because of its low specific gravity and nonflammability, it’s often used in lighter-than-air applications such as the filling of balloons and blimps. Mixtures of helium and oxygen are used as a breathing gas in deep-sea diving. Liquid helium is also used in superconducting magnet applications, including magnetic resonance imaging (MRI).

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