Element symbol girl、elemental neighborhood、colourless、Odorless

element symbol girl、elemental neighborhood、colourless、Odorless、Tasteless、non-toxic（Remove oxygen deficiency）It is the second lightest noble gas element in the periodic table.。Lighter than air and nonflammable、has the lowest boiling point of all elements、Becomes a solid only under pressure。Helium exists as an inert monatomic gas。Also、It is the second most abundant substance in the universe after hydrogen.。Helium is 0 in the Earth's atmosphere..0005 %occupy、It is also dissolved in minerals and mineral water.。Produced in very small amounts along with natural gas、Used as flotation gas for balloons and small airships、Using liquid helium as a low-temperature material for superconductivity、Used as a breathing gas when diving to great depths。 Under standard conditions、Helium exists as a monatomic gas。Helium must be placed under very special conditions to solidify.。It has the lowest boiling point among the elements、Under standard pressure, it remains a liquid even at temperatures close to absolute zero.、High pressure must be applied to solidify。The critical temperature is 5.Very low at 19 K。Solid helium requires different pressures for helium-3 and helium-4.、Adjust the pressure to 30% of the volume %can be controlled。Helium has a very high specific heat capacity、becomes dense vapor、Expands as the temperature of the room increases。 solid helium is 1.5 K、2.5–3.Can only exist at extremely low temperatures and high pressures of 5 MPa。When the temperature exceeds this level、cause a phase transition。At temperatures below this, each form a cubic-shaped molecule.。 Duration: 1 minute and 1 second.1:01 Helium laser Helium 4 two liquid states、helium I and helium II、Quantum mechanics research（superfluid phenomenon）important in、It occurs at extremely low temperatures close to absolute zero, where materials become superconducting.。

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