(adsbygoogle = window.adsbygoogle || []).push({}); what volume does the "v" in pv denotes?

say that in a system where pressure is constant Mg reacts with O_{2}.when dealing with above reaction thermodynamically,

H_{I}=U_{I}+PV_{I}

where H is the initial enthalpy of the system

U_{I}is the initial internal energy of the system.

And my question is that what does the V_{I}denotes in the equation.Is it the volume of magnesium and oxygen?

Likewise when we write the equation after the reaction, what does the V_{F}denotes?Is it the volume of magnesium oxide formed ?

can anyone explain?

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# What volume does the v in pv denotes?

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