Liquid Argon

Argon (Ar) is a monatomic, colorless, odorless, tasteless and nontoxic gas, present in the atmosphere at a concentration of just under 1% (0.934%) by volume. Argon is a member of a special group of gases known as the "rare," "noble," or "inert" gases. Other gases in this group are helium, neon, krypton, xenon and radon. They are monatomic gases with a totally filled outermost shell of electrons. The terms "noble" and "inert" have been used to indicate that their ability to chemically interact with other materials is extremely weak. All members of this group emit light when electrically excited. Argon produces a pale blue-violet light

Argon's normal boiling point is a very cold -302.6°F (-185.9°C). The gas is approximately 1.4 times as heavy as air and is slightly soluble in water. Argon's freezing point is only a few degrees lower than its normal boiling point, -308.8°F (-199.3°C).