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Topic: Hot sample on a balance  (Read 3812 times)

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Offline ryan12491

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Hot sample on a balance
« on: October 13, 2007, 08:26:10 PM »
If you have a sample that you are weighing, and it is hot, will it be lighter or heavier than if it was cool?
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Offline LQ43

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Re: Hot sample on a balance
« Reply #1 on: October 13, 2007, 09:45:57 PM »
Lighter when it is hot, heavier when it is cool, it will collect water vapor that condenses as it cools
« Last Edit: October 13, 2007, 10:54:35 PM by LQ43 »
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Offline Borek

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Re: Hot sample on a balance
« Reply #2 on: October 14, 2007, 03:20:52 AM »
Think about thermal expansion and buoyancy.
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Offline macman104

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Re: Hot sample on a balance
« Reply #3 on: October 15, 2007, 12:06:09 AM »
Quote from: LQ43 on October 13, 2007, 09:45:57 PM
Lighter when it is hot, heavier when it is cool, it will collect water vapor that condenses as it cools
For these reasons, you should let things cool under vacuums or in dessicators.
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