Question

A manometric liquid should ideally have

• A. Low density and low vapour pressure
• B. Low density and high vapour pressure
• C. High density and low vapour pressure
• D. High density and high vapour pressure

Answer 1

The correct option is C High density and low vapour pressure

High density is favourable because the height of the column required for the manometer would be low.
A liquid with high vapour presure would be less sensitive to changes in pressure and may result in a slower rise of the manometric fluid. Thus, a fluid with low vapour pressure is favourable.
Option (c) is correct.