Question

3.1. The gage pressure in a pipe is measured by a manometer containing mercury (density = 13 600 kg/m^3). The top of the mercury is open to the atmosphere and the atmospheric pressure is 100 kPa. If the mercury column height is 24 cm, the gauge pressure in the pipe is? [2] O 24 kPa O 76 kPa O 32 kPa 68 kPa 124 kPa

Answer 1

Ans. Gauge pressure is pressure measured with respect to atmospheric pressure.

And since we have to find out gauge pressure in the pipe .so we will not consider atmospheric pressure .

Given,

h= height of mercury column = 24 cm = 0.24 m

¶= density of mercury = 13600 kg/m3

g = acceleration due to gravity =9.81 m/sec2

So , Gauge pressure = (h) * (¶) * (g)

= 0.24 * 13600 * 9.81

= 32.02. Kpa

So, option c is correct.

Hope this help