The piezometric head in a static liquid
In a mercury differential manometer used for measuring pressure differences across a venturimeter in a water pipeline, if an error of 2 mm has been made in observing a differential head of 10 mm, the percentage error in pressure difference is:
What is the pressure in Pascals at a depth of 1m below the water surface?
It’s the summation of weights on top of the water surface. In this case, it is the weight of the atmosphere and water above 1m. [Formula: P (depth) = Patm + (density of water*gravitational constant * depth)].
The left leg of a U-tube mercury manometer is connected to a pipeline conveying water, the level of mercury in the leg being 0.6 m below the centre of pipeline, and the right leg is open to atmosphere. The level of mercury in the right leg is 0.45 m above that in the left leg and the space above mercury in the right leg contains Benzene (specific gravity 0.88) to a height of 0.3 m. Find the pressure in the pipe in metres of water.
The pressure, in meters of oil (sp. gr, 0,8), equivalent to 80 m of water is
Match List-1 (Features) with List-ll .(Type of manometers) and select the correct answer using the codes given below the lists:
A. Open ended manometer for positive pressure
B. Negative pressure manometer
C. For measuring pressure in liquids or gases
D. For measuring pressure in liquids only
Absolute pressure in flow system
The pressure measured above the absolute zero or complete vacuum is called absolute pressure.
Absolute pressure = Gauge pressure + Local atmosphere pressure.
also Absolute pressure = Local atmosphere pressure - Negative gauge pressure.
Pressure of 200 kPa is equivalent to a head of h metres of carbon tetrachloride of relative density 1.59 where h is equal to
Mercury is considered as a superior barometric fluid chiefly due to its
Mercury is considered as a superior barometric fluid because of following reasons:
1. High specific gravity- For a same pressure head mercury tube length required will be smaller than that of water
2.Low Vapour Pressure: Thus, influence in readings due to mercury vapours is negligible.
If a Mohr's circle is drawn for a fluid element inside a fluid body at rest, it would be