A simple barometer is constructed using a liquid \(Q_{1}\) of density 16.2\(g/cm^{3}\). Calculate the least lenth of the tube to be used to measure pressure of 1.5atm.  [Density of mercury = 13.6\(g/cm^{3}\), 1atm = 76.0 cm of Mercury]

JThomson

6 years ago

The selected answer is for 1atm; the question asked for 1.5atm and so the answer should have been (1.5/1)×638mm = 957mm

Onyeisiala

7 months ago

1 atm = 76.0 cmHg
So, 1.5 atm = (1.5 × 76.0) cmHg
= 114.0 cmHg

So the 76.0 cmHg used was for 1 atm.