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I have the following problem:

I have a fuel tank, with a liquid phase (the fuel) and gas phase at To and P0, where T is temperature and P pressure. I assume that the gas phase at the instant t=t0 is air.

(Is this assumption correct?)

The temperature of the liquid phase varies over the time with a certain profile from T0 to Tend.

The fuel due to the increasing of the temperature evaporates with a certain law (most probably unknown).

How can I calculate the equilibrium pressure between the two phases according to the temperature changes over the time?

Thanks in advance,

K