
50 Practical Centrifugal Pumps
Following are some examples of vapor pressures for a few common liquids. The vapor
pressure is 1 atm at 100 °C for water, at 78.5 °C for ethyl alcohol, and at 125.7 °C for octane.
Similarly, at 20 °C, water has a vapor pressure of 0.023 atm (17.5 mm Hg). Isopropyl
alcohol (rubbing alcohol) has a vapor pressure of 0.043 atm (33 mm Hg) at 20 °C.
In a liquid solution, the component with the higher vapor pressure is called the light
component (tendency to vaporize quicker), and that with the lower vapor pressure is
called the heavy component.
3.4 Flow
The first and most important point to consider is that centrifug ...