The work of evapouration is illustrated by the image below.

To compute for work of evapouration, three essential parameters are needed and these parameters are **Specific Volume of Dry Gas (v _{g}), Specific Volume of Wet Steam (v_{f})** and

**Pressure of Gas (P).**

The formula for calculating work of evapouration:

W_{E} = P(v_{g} – V_{f})

Where:

W_{E} = Work of Evapouration

v_{g} = Specific Volume of Dry Gas

v_{f} = Specific Volume of Wet Steam

P = Pressure of Gas

Given an example;

Find the work of evapouration when the specific volume of dry gas is 30, the specific volume of wet steam is 0 and the pressure of gas is 10.

This implies that;

v_{g} = Specific Volume of Dry Gas = 30

v_{f} = Specific Volume of Wet Steam = 0

P = Pressure of Gas = 10

W_{E} = P(v_{g} – V_{f})

W_{E} = 10 x (30 – 0)

W_{E} = 10 x 30

W_{E} = 300

Therefore, the **work of evapouration **is **300J.**

**Calculating the Specific Volume of Dry Gas when the Work of Evapouration, the Specific Volume of Wet Steam and the Pressure of Gas is Given.**

v_{g} = ^{WE} / _{P} + v_{f}

Where:

v_{g} = Specific Volume of Dry Gas

W_{E} = Work of Evapouration

v_{f} = Specific Volume of Wet Steam

P = Pressure of Gas

Given an example;

With work of evapouration as 40, the specific volume of wet steam as 0 and the pressure of gas as 10. Find the specific volume of dry gas?

This implies that;

W_{E} = Work of Evapouration = 40

v_{f} = Specific Volume of Wet Steam = 0

P = Pressure of Gas = 10

v_{g} = ^{WE} / _{P} + v_{f}

v_{g} = ^{40} / _{10} + 0

v_{g} = 4

Therefore, the **specific volume of dry gas **is **4.**