Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

Only two property high,

1. High density.
2. High boiling point.

Other than all property should low.

It should be low surface tension due to surface there will be rise or fall of liquid depending upon the contact angle and reading may be less accurate.

The diameter of manometer will be such that capillarity will not be seen. So what is the point in discussing about surface tension?

The right answer is High surface tension.

It should be high density and low vapour pressure.

Mercury used in manometer and it has high sufrace tention property.

The liquid used in manometers should have high density so that the height of the column can be reduced. Because the manometers are used for high-pressure.

The liquid used in manometers should have a high density so that the height of the column can be reduced. Because the manometers are used for high-pressure measurement, it is important to make the column height within a practical limit.

Most of case, for gauge pressure measurements, mercury is widely used as manometric fluid because it has non-evaporating quality under normal conditions, sharp meniscus and stable density. For some pressure differences and low-level vacuum, water can be considered as the working fluid in the manometer.

Important Points:

Manometric fluid should have a low surface density to have higher accuracy in the reading.
∴ Low surface tension is one of the desirable properties but the most important property is the property of being highly densified.

@All.

Some people say high surface tension is the correct option. No, it is incorrect as it will reduce the efficiency of the manometer.

High density should be the correct answer.

High density should be the answer.