Argon is the third most abundant gas in Earth's atmosphere, at 0.934% (9340 ppmv). It is more than twice as abundant as water vapor (which averages about 4000 ppmv, but varies greatly), 23 times as abundant as carbon dioxide (400 ppmv), and …

Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.

Apr 12, 2025 · argon (Ar), chemical element, inert gas of Group 18 (noble gases) of the periodic table, terrestrially the most abundant and industrially the most frequently used of the noble gases. Colourless, odourless, and tasteless, argon gas was isolated (1894) from air by the British scientists Lord Rayleigh and Sir William Ramsay.

Argon provides an inert and clean environment free from nitrogen and oxygen for annealing and rolling metals and alloys. In the casting industry, argon is used to flush porosity from molten metals to eliminate defects in castings.

Argon is the most abundant noble gas; the others—helium, neon, krypton, xenon, and radon—are present in the air in even smaller amounts. Argon has 18 protons in its nucleus and is therefore denoted by atomic number 18 on the periodic table.

Apr 24, 2023 · Purification of Air. Because it absorbs oxygen and has a great capacity for eliminating other gases such as carbon dioxide and ozone, argon has been used to clean air. These gases can aggravate asthma episodes, bronchitis, and other respiratory issues. Health Effects of Argon

Argon was suspected to be present in air by Henry Cavendish in 1785 but wasn't discovered until 1894 by Lord Rayleigh and Sir William Ramsay. Argon is the third noble gas, in period 8, and it makes up about 1% of the Earth's atmosphere.

Argon is used to protect liquid metal from reactions with compounds present in ambient air, such as oxygen. It is also used for the same reasons in many welding processes.

Argon is a gas at standard conditions. However, at low temperature and/or high pressures the gas becomes a liquid or a solid. The argon phase diagram shows the phase behavior with changes in temperature and pressure. The curve between the critical point and the triple point shows the argon boiling point with changes in pressure.

Jan 21, 2025 · Argon is most commonly produced as a byproduct of oxygen and nitrogen production through the fractional distillation of liquid air, a process in which air is cooled to a liquid state and then gradually heated in a distillation column.