A liquid of specific gravity 0.68 is flowing through a venturimeter having inlet diameter 50 cm and throat diameter 30 cm. The liquid-mercury differential manometer shows a reading of 20 cm. The specific gravity of mercury is 13.6. Find the difference of the pressure head.
1
3.8 m of liquid
2
2 m of liquid
3
5 m of liquid
4
5.8 m of liquid