1. Oxygen is a component of air, colorless, odorless and tasteless.
2. Oxygen is heavier than air. Under standard conditions (0 ℃ and atmospheric pressure 101325 Pa), the density is 1.429 g/L, which can be dissolved in water, but the solubility is very small (insoluble in water, slightly soluble).
3、）。
4. When the pressure is 101kPa, oxygen becomes a light blue liquid at about - 180 ℃, and a light blue solid like snowflakes at about - 218 ℃.
