Here's why:
* Oxygen's boiling point: Oxygen's boiling point is -183 degrees Celsius (-297 degrees Fahrenheit). This means that at temperatures above this point, oxygen exists as a gas.
* Oxygen's freezing point: Oxygen's freezing point is -218.8 degrees Celsius (-361.8 degrees Fahrenheit). This means that at temperatures below this point, oxygen exists as a solid.
Since 0 degrees Celsius is well above oxygen's boiling point, it will remain in its gaseous state.
