....... and .......are used in the construction of manometer
Answers
Explanation:
It is easily constructed .It consists of tube of glass bent into U shaped.
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Explanation:
Manometer is also called a liquid column manometer and is used for low differential pressure measurement. The usual range of pressure that falls for this device is around 0.2 MPa or 2 Kg/cm2. This device is used for most cases as it is very simple in construction and highly accurate of all the types.
There are basically two types of manometers.
U-Tube Manometer
Well Type Manometer
There are also variations of the above said basic types called Enlarged-Leg Type Manometer, and Inclined Tube Manometer. Another manometer used commercially is the Ring-Balance Type Manometer.
U-Tube Manometer
A simple u-tube manometer is shown below. If ‘dm‘is the manometric fluid density, ‘d1’ is the density of the fluid over the manometer, ‘P2’ is the atmospheric pressure (for general measurement of gas pressure) and ‘P1’ is the gas pressure, and also if d1<<dm, then the differential pressure can be obtained by the relation
p1-p2 = h (dm-d1)

U-Tube Manometer
An enhanced version of a manometer is shown below with a seal liquid over the manometer liquid to separate the process fluid from the manometer fluid for any probable source of trouble like absorption, mixing or explosion and so on. Seal pots with large diameters are also placed for increasing the range. The equation for differential pressure is the same as mentioned above.

Manometer With Large Seal Pots
Well-Type Manometer
The main difference between a U-tube manometer and a well type manometer is that the U-tube is substituted by a large well such that the variation in the level in the well will be negligible and instead of measuring a differential height, a single height in the remaining column is measured. If a1 and a2 are the areas of the well and the capillary, and if (h1-h2) is the difference in height in the well due to the pressure difference (p1-p2) as shown, at balance, then
p1-p2 = dm.h (1+a2/a1)
The figure of a well-type manometer is shown below.

Well-Type Manometer
Enlarged-Leg Manometer
In the enlarged-leg manometer, a2 is not negligible compared to a1. It has a float in the enlarged-leg which is utilized for indication or recording. The two legs can be changed for changing the measurement span. Thus, the equation becomes,
p1-p2 = dm.h