... nitrogen, helium, hydrogen, oxygen, carbon monoxide, etc. Argon gas Nature: colorless and odorlessMelting/Freezing Point: -308F(-189°C) ... 380(air=1) Argon is considered a rare atmospheric gas which is colorless, odorless, tasteless and nontoxic.It ... , incandescent and fluorescent lamps, electronic tubes, window insulation, welding, and semiconductor applications. Name MF Purity Impurity content (ppm ...