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Because gas molecules will be further apart from each other than those of a liquid, the same amount of substance will have a different volume as a gas than a liquid. If you're transporting or storing a substance that can be either a gas or a liquid, it is much more efficient to keep it as a liquid. By doing this, you will be able to have more of the substance in one place. For example, if you had to store 3 moles of nitrogen, it would be easier to have 0.1 L of liquid than 20 L of gas (numbers not accurate).

In order to keep a substance (like nitrogen) that will always naturally occur as a gas, it has to be subject to extreme pressure within a container. (In the case of nitrogen, a certain amount of cooling of the gas/liquid must also take place). In the case of propane tanks, there will be an opening where pressure is slowly released. When the pressure goes back down, the liquid inside will go back to being a gas.

The liquid in a gas container is sort of like "concentrated gas", which can be "unconcentrated" by releasing the pressure.

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14y ago
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12y ago

A gas will always expand to fill its entire container. If you try to half fill a cylinder with a gas, the gas will almost immediately expand to fill the whole thing

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12y ago

If there is liquid in it then it is not empty. However the liquid may not be propane.

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Q: Why a gas cylinder cannot be half filled?
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