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A student wants to find the absolute pressure of water at a point below the surface of water. He has a barometer and a manometer pressure gauge. The barometer reads 1.3152 bar where as the manometer pressure gauge reads 0.3152 bar. What is the absolute pressure? (Assume that pressure at one end of the manometer is atmospheric.)
  • a)
    1 bar
  • b)
    1.6304 bar
  • c)
    0.3152 bar
  • d)
    1.3152 bar
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A student wants to find the absolute pressure of water at a point belo...
The options may tempt you to subtract the readings, but the concept of barometer and manometer is important. Barometer measures the atmospheric pressure whereas, the manometer reads the gauge pressure. Hence, we need to add the two values.
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Community Answer
A student wants to find the absolute pressure of water at a point belo...
To find the absolute pressure of water at a point below the surface, we need to consider the atmospheric pressure and the additional pressure due to the depth of the point below the surface. We can use the barometer and manometer pressure gauge readings to calculate the absolute pressure.

Given:
Barometer reading = 1.3152 bar
Manometer pressure gauge reading = 0.3152 bar

1. Calculate the atmospheric pressure:
The barometer reading gives us the atmospheric pressure. Therefore, the atmospheric pressure is 1.3152 bar.

2. Calculate the additional pressure due to the depth:
The manometer pressure gauge reading gives us the additional pressure due to the depth below the surface. Since the pressure at one end of the manometer is atmospheric, we need to subtract the manometer reading from the atmospheric pressure to get the additional pressure due to depth.

Additional pressure due to depth = Atmospheric pressure - Manometer pressure gauge reading
= 1.3152 bar - 0.3152 bar
= 1 bar

3. Calculate the absolute pressure:
The absolute pressure is the sum of the atmospheric pressure and the additional pressure due to depth.

Absolute pressure = Atmospheric pressure + Additional pressure due to depth
= 1.3152 bar + 1 bar
= 2.3152 bar

Therefore, the absolute pressure of water at the point below the surface is 2.3152 bar.

The correct answer is option B: 1.6304 bar.
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A student wants to find the absolute pressure of water at a point below the surface of water. He has a barometer and a manometer pressure gauge. The barometer reads 1.3152 bar where as the manometer pressure gauge reads 0.3152 bar. What is the absolute pressure? (Assume that pressure at one end of the manometer is atmospheric.)a)1 barb)1.6304 barc)0.3152 bard)1.3152 barCorrect answer is option 'B'. Can you explain this answer?
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