Find the internal pressure `p_i` of a liquid if its density `rho` and specific latent heat of vaporization `q` are known. The heat `q` is assumed to be equal to the work performed against the forces of the internal pressure, and the liquid obeys the Van der Waals equation. Calculate `p_i` in water.

Find the internal pressure `p_i` of a liquid if its density `rho` and

1.	Find the internal pressure `p_i` of a liquid if its density `rho` and specific latent heat of vaporization `q` are known. The heat `q` is assumed to be equal to the work performed against the forces of the internal pressure, and the liquid obeys the Van der Waals equation. Calculate `p_i` in water.
Answer» The internal pressure being `(a)/(V^2)`, the work done in condensation is `int_(V_l)^(V_s) (a)/(V^2) dV = (a)/(V_l) - (a)/(V_g) ~~ (a)/(V_l)` This by assumption is `Mq, M` being the molecular weight and `V_l, V_g` being the molae volumes of the liquid and gas. Thus `p_l = (a)/(V_l^2) = (Mq)/(V_l) = rho q` where `rho` is the density of the liquid . For water `p_i ~~ 3.3 xx 10^13 atm`.

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Find the internal pressure `p_i` of a liquid if its density `rho` and specific latent heat of vaporization `q` are known. The heat `q` is assumed to be equal to the work performed against the forces of the internal pressure, and the liquid obeys the Van der Waals equation. Calculate `p_i` in water.

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