Analysis of the Properties of Helium and Liquid Helium

Helium, liquid helium

The properties of helium are similar to ideal gases at high temperatures. To a large extent, one can attempt to describe the ideal equation of state for gases. To more accurately describe the properties of helium, the Viry equation can be used to calculate its thermodynamic properties.

Buy high-purity helium and find Wuhan Yisi Tuopu Technology Co., Ltd. Click on the online inquiry or call our hotline at+86 189 8614 9031.

From the helium phase diagram, it can be seen that helium has two different liquid phases at low temperatures; The superfluid helium phase (HeII) and the constant flow helium phase (HeI) are separated by a phase interface in between, and because their shape resembles an inverted Greek letter, they are called lines. Superfluid helium is a quantum fluid, while superfluid helium, usually liquid helium, is a common low-temperature fluid with properties similar to liquid helium and other low-temperature fluids.

The critical temperature and pressure of helium are 5.195K and 0.275Pa, respectively. The boiling point of helium at atmospheric pressure is 4.2K. Due to the small molecular weight and gravity of helium, it has a large zero energy and remains in a liquid state even at 0K. At high pressures, as the temperature decreases, it becomes solid. Only when the pressure is greater than 2.5mPa can it become solid helium, without a solid and gas phase interface, that is, without a sublimation curve. It is worth mentioning that recent breakthroughs have been made in the study of solid-state helium.