Oxygen is colorless, odorless, and insipid. It is reactive and forms oxides with every element except helium, neon, krypton, and argon. Liquid oxygen is slightly paramagnetic. It has a density of 0.001308 g cm−3. It melts at -219 °C and boils at -183 °C. Hydrogen is a colorless, odorless, tasteless, and a highly combustible gas. It has a density of 0.000082 g cm−3. It melts at −259.16°C and boils at...
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