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I keep hearing that enthalpy is not directly measurable and that on it's own it carries no physical signifigance. But if you have a gas in a container for example, it has some internal energy which I'm assuming is measurable (a least in principle), and you can also measure its pressure as well as its volume. So how is it not measuable? Also, I've been told that enthalpy basically gives you the total energy possesed by a system at any point in time and that it's equivalent to the energy required to create the system. So there is some physical signifigance to enthalpy on its own? I'm so confused