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A barometer has liquid-1 with density 5 Kg/m^3 and height 10 cm below the outside level above that there is liquid-2 of length 5 cm, if the gauge pressure of the gas is 1 Pa, what is the density of liquid-2?(a) 2 Kg/m^3(b) 4 Kg/m^3(c) 6 Kg/m^3(d) 8 Kg/m^3This question was addressed to me in an online interview.Asked question is from Differential Pressure Measurements topic in section Temperature and Pressure of Basic Chemical Engineering

Answer» RIGHT choice is (d) 8 Kg/m^3

The explanation is: Gauge pressure of gas + Pressure of liquid-2 = Pressure of liquid-1, => 1 + d*10*0.05 = 5*10*0.1, => d = 8 Kg/m^3.


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