The whole point of keeping propane in a pressurized cylindar is in order to maintain the liquid form (with some vapor). Inside the cylinder it shouldn’t evaporate, if anything it just escaped as a gas into the atmosphere. If this is the case, then you might want to check if it was indeed closed completely or if it leaked. Other than the constant exchange between vapor and liquid inside the cylinder, there is no evaporation process that the propane undergoes. Once it has become a gas it is a gas and not vapor–two different things.
At standard temperature and pressure (STP), propane is a gas. To become liquid, propane is compressed and held inside tanks. This is done primarily to make a transportable fuel for applications that require a “containerized” solution…remote homes, specialty transportaion like forklifts, and of course camp stoves and lanterns.
Inside a compressed propane tank, the space over the top of the liquid propane is filled with propane gas. As the tank valve is opened, most applications are pulling off this gas which reduces the pressure above the liquid causing more gas to vaporize and fill the space. As new liquid vaporizes, it take in energy to satisfy the heat of vaporization which is why running propane tanks feel cold. In some specialty applications, propane liquid will be fed to large energy users, but those applications are rare.
When fuels evaporate this specifically refers to liquid fuels flashing over to the gaseous state. Every fuel has a temperature at standard atmospheric pressure where this transition occurs. This is called the fuel’s flash point. Some fuels like gasoline have a very low flash point. This means that at most temperatures, the liquid fuel is evaporating to a gas which can create a flammable gaseous cloud above or near the liquid fuel. In other cases, like with diesel fuel, the fuel has a much higher flash point. This means that at reasonable temperatures, the fuel will remain a liquid and have a lower hazard of flammable vapors.
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