Saturation Line:
The saturation line shows the states of saturated air at different temperatures. As an instance of fixing such a state on the chart, refer an atmosphere A at 20 oC and saturation as illustrated in Figure. From the steam tables at 20 oC, water vapours pressure
![112_Saturation Line.png](https://www.expertsmind.com/CMSImages/112_Saturation%20Line.png)
(a) T-s diagram of water (b) Psychrometric Chart
Saturated Air at 20 oC
ps= pv = 17.54 mm Hg =2342 N/m2
Partial pressure of dry air
pa=p - pv =101325-2342 = 98983 N/m2
Specific humidity at 20 oC saturation
![1609_Saturation Line1.png](https://www.expertsmind.com/CMSImages/1609_Saturation%20Line1.png)
Knowing t & ω, point a may be plotted. Similarly, saturation states at other temperatures might also be plotted to sketch the saturation line on the psychrometric chart.