Question

A manometer is an instrument used to measure:
(A) Height
(B) Pressure
(C) Liquid Density
(D) Atmospheric Pressure

Answer 1

Hint : The word manometer is commonly used to mean a pressure sensor. A sphygmomanometer is a device physician and medical professionals use to measure and monitor a patient’s blood pressure.

Complete step by step answer
Manometers are precision instruments that are used to measure pressure, which is the force exerted by a gas or liquid per unit surface area owing to the effects of the weight of that gas or liquid from gravity. Depending on the type and how they are configured, manometers can be set-up to provide a measurement of different pressure values.
A manometer is any device used to measure pressure. However, the word manometer is commonly used to mean a pressure sensor which detects pressure change by means of liquid in a tube.
Manometers are differential pressure sensors. A differential pressure sensor measures the difference between a pressure being applied to it and a reference pressure (often atmospheric pressure).
Hence the correct answer is Option B.

Note
A manometer can be designed to directly measure absolute pressure. The manometer in Figure 5 measures the pressure compared to zero absolute pressure in a sealed leg above a mercury column. The most common form of this manometer is the conventional mercury barometer used to measure atmospheric pressure. With just one connection, this configuration can measure pressures above and below atmospheric pressure.
Manometers can be broadly classified as being of two principal types, analogue manometers and digital manometers-
Analogue manometers make use of a fluid that is contained in a U-shaped tube and operates using the principle of Hydrostatic Balance. The fluid in the tube will settle to equal height in each leg of the tube when both ends are open to atmospheric pressure.
Digital manometers contain a pressure transducer, a device that can convert an observed pressure level into an electrical signal whose characteristic value is proportional to, or a proxy for, the magnitude of the pressure.