If gasoline and petrol are the same, where does LPG (Liquid Petroleum Gas) come into It and how can it be a liquid and a gas?
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LPG means ***Liquefied*** *Petroleum Gas*. So not ‘liquid’, but ‘liquefied’. It is a liquid, but the point is that it started out as a gas. Or really a mixture of gases, usually propane, butane and propylene. We (at least in daily speech) refer to these substances as gases, not because they can only ever be a gas, but because that’s how we usually encounter them, at typical temperatures (not much warmer or colder than room temp) and typical pressures (around 1 atmosphere). But you can make them liquid by cooling them or putting them under pressure (in practice usually the latter). Why would you want to do that? Well, because in liquid form, they’re much denser. Which means that you can actually put a decent amount of this fuel in a reasonably-sized (pressurized) tank inside your car, rather than having to carry it around in a gigantic balloon or something.
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