a object measured by springe balance first in air then in vacuum.in which case weight of object is more and why
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When measuring mass in a vacuum, would it be higher or lower than when measured in an ordinary Earth room?
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David Seed, physcs A level, Mechnaical engineering BSc
Answered Nov 4, 2014 · Author has 1.1kanswers and 635k answer views
In a vacuum, the man weighs 0.1% more.
the net force exerted on the scales, is what is indicated.
The air pressure will make no difference since it operates above and below the scale pan.
To prove this point, Put a spring balance under water where the pressure is higher, it wont change due to pressure, try it at the top of swimming pool and at the bottom, the reading will be the same.
What does make a difference is buoyancy. Imagine instead of air we are dealing with water. A person in water weighs less than in a vacuum. By the amount ( density of fluid x volume of object ) ( Archimedes principle)
A human body has roughly neutral buoyancy in water.
Water has a density of 1kg per litre,
So we can can estimate the volume of the person as W litres
( where W is the weight of the person in kg)
The density of air is about 1/1000 that of water about 1gram per litre.
So if the person weighs W kilos in air, then in a vacuum deprived of that buoyancy, he'll weigh W grams more.
Still have a question? Ask your own!
What is your question?
7 ANSWERS

David Seed, physcs A level, Mechnaical engineering BSc
Answered Nov 4, 2014 · Author has 1.1kanswers and 635k answer views
In a vacuum, the man weighs 0.1% more.
the net force exerted on the scales, is what is indicated.
The air pressure will make no difference since it operates above and below the scale pan.
To prove this point, Put a spring balance under water where the pressure is higher, it wont change due to pressure, try it at the top of swimming pool and at the bottom, the reading will be the same.
What does make a difference is buoyancy. Imagine instead of air we are dealing with water. A person in water weighs less than in a vacuum. By the amount ( density of fluid x volume of object ) ( Archimedes principle)
A human body has roughly neutral buoyancy in water.
Water has a density of 1kg per litre,
So we can can estimate the volume of the person as W litres
( where W is the weight of the person in kg)
The density of air is about 1/1000 that of water about 1gram per litre.
So if the person weighs W kilos in air, then in a vacuum deprived of that buoyancy, he'll weigh W grams more.
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