Question

The principle of McLeod Gauge is the compression of a sample of a low pressure gas to a pressure sufficiently high to read with a

• A. Manometer
• B. Diaphragm
• C. Bellow
• D. Bourdon Tube

Hint:

A McLeod gauge measures very low pressures using \[ \boxed{\text{Boyle's law }(PV=\text{constant}).} \] The compressed gas pressure is read using a manometer.

Answer 1

The Correct Option is A

Step 1: Recall the working principle of a McLeod gauge. A McLeod gauge measures very low pressure by compressing a known volume of gas.

Step 2: Identify the measuring device. After compression, the pressure becomes high enough to be measured using a \[ \boxed{\text{Manometer}.} \] Hence, \[ \boxed{(A)} \] is the correct answer.