A "vaporiser", as it name suggests, has something to do with producing "vapour". So before going onto discussing vaporisers, we need to have some idea as to what a vapour is. And, unfortunately, to understand what a vapour is, we need to know about something called critical temperature.
If you take a gas, and compress it really hard, the particles that compose it are brought ever so close to each other. As you keep compressing , the particles will at some point coalesce and convert the gas into liquid. However, if the gas is above a certain temperature, called a "critical temperature", whatever amount of pressure you apply, that gas will not become a liquid. This temperature is called "critical temperature" and every gas has its particular critical temperature. For Isoflurane, it is about 200 degrees Celsius. Now to what a vapour is:
A gas that is currently below its critical temperature is called a “vapour”. If compressed with enough pressure, it will condense into a liquid.
A gas that is currently above its critical temperature remains a gas. However hard you compress it, it will not condense into a liquid.
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