Because oxygen is a gas that naturally occurs in the environment, you rarely encounter it as either solid or liquid.
Oxygen is a substance that, depending on its temperature and pressure, can exist as a solid, liquid, or gas. It exists as a gas, specifically a diatomic gas, in the atmosphere. Because oxygen is a gas that naturally occurs in the environment, you rarely encounter it as either solid or liquid. Since gas has too much energy to have volume or structure, it cannot be solid or liquid. Because the tank keeps the gas contained, you can't see oxygen in the air outdoors or in substances like water, which is why you see oxygen tanks (water).
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