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Weighing Hot Objects
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Segun Fawole
Nov 11, 2020, 2:30:44 AM11/11/20
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How can one get the actual weight of a hot object? Is there a mathematical or any expression that helps to correct for the convection caused by hot air?
Dean
Nov 11, 2020, 7:35:19 AM11/11/20
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On Wednesday, November 11, 2020 at 2:30:44 AM UTC-5, Segun Fawole wrote:
> How can one get the actual weight of a hot object? Is there a mathematical or any expression that helps to correct for the convection caused by hot air?
You must simply weigh it in a vacuum.
> How can one get the actual weight of a hot object? Is there a mathematical or any expression that helps to correct for the convection caused by hot air?
micky
Nov 14, 2020, 10:26:07 PM11/14/20
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In sci.chem, on Tue, 10 Nov 2020 23:30:42 -0800 (PST), Segun Fawole
heat make it seem to weigh less than it really does, even if it's
sitting on a scale? Which?
<segunf...@gmail.com> wrote:
>How can one get the actual weight of a hot object? Is there a mathematical or any expression that helps to correct for the convection caused by hot air?
Is it floating too? You can't put it on a scale, OR you think that its
>How can one get the actual weight of a hot object? Is there a mathematical or any expression that helps to correct for the convection caused by hot air?
heat make it seem to weigh less than it really does, even if it's
sitting on a scale? Which?
mrou...@shaw.ca
Nov 15, 2020, 11:40:17 AM11/15/20
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On Wednesday, November 11, 2020 at 12:30:44 AM UTC-7, Segun Fawole wrote:
> How can one get the actual weight of a hot object? Is there a mathematical or any expression that helps to correct for the convection caused by hot air?
Short answer: suppress convection by putting the hot object inside a closed box (which was weighed ahead of time). You would still have to worry about buoyancy corrections, but that's an easier problem.
> How can one get the actual weight of a hot object? Is there a mathematical or any expression that helps to correct for the convection caused by hot air?
In a quick (not thorough) search, I found the following: https://www.sciencedirect.com/science/article/abs/pii/0040603186800107
The authors of this paper suggest that convection can create errors in weighing of the order of micrograms. Of course, that would depend on many, many details. I don't think there is any hope of applying a simple formula to calculate a correction. Avoiding the issue by suppressing convection is still your best bet.
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