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In the space above the mercury column in a barometer tube, the gauge pressure of the vapour is
- a)positive, but more than one atmosphere
- b)negative
- c)zero
- d)positive, but less than one atmosphere
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
In the space above the mercury column in a barometer tube, the gauge p...
Concept:
The barometer is an instrument used to measure the pressure of air. There are two typed of barometers, the mercury manometer and, aneroid barometer.
Mercury barometer: In a mercury barometer a tube filled with mercury is placed upright with its open end down into a container of more mercury.
Air pressure on the mercury in the container keeps the mercury from draining out of the tube.
Aneroid barometer: An aneroid barometer uses a flexible metal bellows instead of mercury to measure air pressure.
Calculation:
The gauge pressure = Pabs - Patm
At atmospheric pressure the gauge pressure = 0
Now if we write the equation for pressure in vertical column then,
Patm – ρm × g × h – Pvapour = 0
⇒ Patm = ρm × g × h + Pvapour
Now Since At atmospheric pressure the gauge pressure = 0
(Pvapour)gauge = -ρm × g × h
∴ Gauge pressure of vapour will be negative.
The barometer is an instrument used to measure the pressure of air. There are two typed of barometers, the mercury manometer and, aneroid barometer.
Mercury barometer: In a mercury barometer a tube filled with mercury is placed upright with its open end down into a container of more mercury.
Air pressure on the mercury in the container keeps the mercury from draining out of the tube.
Aneroid barometer: An aneroid barometer uses a flexible metal bellows instead of mercury to measure air pressure.
Calculation:
The gauge pressure = Pabs - Patm
At atmospheric pressure the gauge pressure = 0
Now if we write the equation for pressure in vertical column then,
Patm – ρm × g × h – Pvapour = 0
⇒ Patm = ρm × g × h + Pvapour
Now Since At atmospheric pressure the gauge pressure = 0
(Pvapour)gauge = -ρm × g × h
∴ Gauge pressure of vapour will be negative.
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Community Answer
In the space above the mercury column in a barometer tube, the gauge p...
Concept:
The barometer is an instrument used to measure the pressure of air. There are two typed of barometers, the mercury manometer and, aneroid barometer.
Mercury barometer: In a mercury barometer a tube filled with mercury is placed upright with its open end down into a container of more mercury.
Air pressure on the mercury in the container keeps the mercury from draining out of the tube.
Aneroid barometer: An aneroid barometer uses a flexible metal bellows instead of mercury to measure air pressure.
Calculation:
The gauge pressure = Pabs - Patm
At atmospheric pressure the gauge pressure = 0
Now if we write the equation for pressure in vertical column then,
Patm – ρm × g × h – Pvapour = 0
⇒ Patm = ρm × g × h + Pvapour
Now Since At atmospheric pressure the gauge pressure = 0
(Pvapour)gauge = -ρm × g × h
∴ Gauge pressure of vapour will be negative.
The barometer is an instrument used to measure the pressure of air. There are two typed of barometers, the mercury manometer and, aneroid barometer.
Mercury barometer: In a mercury barometer a tube filled with mercury is placed upright with its open end down into a container of more mercury.
Air pressure on the mercury in the container keeps the mercury from draining out of the tube.
Aneroid barometer: An aneroid barometer uses a flexible metal bellows instead of mercury to measure air pressure.
Calculation:
The gauge pressure = Pabs - Patm
At atmospheric pressure the gauge pressure = 0
Now if we write the equation for pressure in vertical column then,
Patm – ρm × g × h – Pvapour = 0
⇒ Patm = ρm × g × h + Pvapour
Now Since At atmospheric pressure the gauge pressure = 0
(Pvapour)gauge = -ρm × g × h
∴ Gauge pressure of vapour will be negative.
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In the space above the mercury column in a barometer tube, the gauge pressure of the vapour isa)positive, but more than one atmosphereb)negativec)zerod)positive, but less than one atmosphereCorrect answer is option 'B'. Can you explain this answer?
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