Scientific High Purity Helium He Gas Packed In DOT Cylinders 10L - 50L

Scientific High Purity Helium He Gas Packed In DOT Cylinders 10L - 50L

Description:

Although it is rare on Earth, helium is the second most abundant element in the known Universe , constituting 23% of its baryonic mass. The vast majority of helium was formed by Big Bang nucleosynthesis one to three minutes after the Big Bang. As such, measurements of its abundance contribute to cosmological models.

Neutral helium at standard conditions is non-toxic, plays no biological role and is found in trace amounts in human blood.

Unlike any other element, helium will remain liquid down to absolute zero at normal pressures. This is a direct effect of quantum mechanics: specifically, the zero point energy of the system is too high to allow freezing. Solid helium requires a temperature of 1–1.5 K and about 25 bar of pressure. It is often hard to distinguish solid from liquid helium since the refractive index of the two phases are nearly the same. The solid has a sharp melting point and has a crystalline structure, but it is highly compressible; applying pressure in a laboratory can decrease its volume by more than 30%.

Since helium has a lower boiling point than any other element, low temperature and high pressure are used to liquefy nearly all the other gases . The resulting crude helium gas is purified by successive exposures to lowering temperatures, in which almost all of the remaining nitrogen and other gases are precipitated out of the gaseous mixture.

While balloons are perhaps the best known use of helium, they are a minor part of all helium use. Helium is used for many purposes that require some of its unique properties, such as its low boiling point, low density, low solubility, high thermal conductivity, or inertness. The largest use is in cryogenic applications, most of which involves cooling the superconducting magnets in medical MRI scanners and NMR spectrometers. Other major uses were pressurizing and purging systems, welding, maintenance of controlled atmospheres, and leak detection. Other uses by category were relatively minor fractions.

Specifications:

1. Physical properties

2. Typical technical data (COA)

3. Package

Applications: