To convert oxygen gas to solid, we need to continuous withdrawal of heat from the gas by cooling.
Matter is composed of particles and these particles that compose matter are always in constant motion. This is the main thrust of the so called Kinetic Theory of Matter.
Now we know that the particles that compose a solid are held in a fixed position thus they spread out or expand when heated. The particles of a liquid tend not to be held in fixed positions thus they can be poured.
Given that oxygen has a boiling point of -219°C and a freezing point of -183°C, it follows that at 0°C is a gas and at -200°C, oxygen is a liquid.
To convert oxygen gas to solid, we need to continuous withdrawal of heat from the gas by cooling.
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