Physical And Chemical Properties Of Helium

Liquid helium is a physical state of helium at very low temperatures if it is at standard atmospheric pressures.

Physical and chemical properties of helium. This webelements periodic table page contains physical properties for the element helium. At standard pressure the chemical element helium exists in a liquid form only at the extremely low temperature of 269 c about 4 k or 452 2 f. Physical properties helium is a colorless odorless tasteless gas. The boiling and freezing points of helium are lower than those of any other known substance.

Helium is a chemical element with the atomic number 2 meaning that a neutral helium atom has two protons and two electrons. For example it has the lowest boiling point of any element 268 9 c 452 0 f. In a body centered cubic bcc arrangement of atoms the unit cell consists of eight atoms at the corners of a cube and one atom. Helium he cid 23987 structure chemical names physical and chemical properties.

The boiling point for a gas is the temperature at which the gas changes to a liquid. This application goes on in altitude research and for meteorological balloons. It is denoted by the symbol he. Helium has many unique properties.

Liquid helium may show superfluidity. Helium was the first gas used for filling balloons and dirigibles. Helium he helium is the element whose atomic number is 2. 2 signifies that at 70 f the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Specific heat 70 f btu lbmol f 4 97. The most important chemical properties of helium include its atomic mass state of matter boiling and melting points and density. In a face centered cubic fcc arrangement of atoms the unit cell consists. 1 signifies at 70 f the compound is above its critical temperature.

The second lightest element only hydrogen is lighter helium is a colourless odourless and tasteless gas that becomes liquid at 268 9 c 452 f. Low boiling point low density low solubility high thermal conductivity and inertness so it is use for any application which can explioit these properties. The three most common basic crystal patterns are.