this post was submitted on 30 Aug 2026
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[–] tyler@programming.dev 69 points 1 day ago (3 children)

The physicist’s answer would be correct anywhere, no matter the temperature or density of the fluid.

[–] montechristo@feddit.org 28 points 1 day ago

Supposing that the measurements with and without the sphere are taken under identical circumstances. But you deserve the upvote either way.

[–] untorquer@quokk.au 13 points 1 day ago* (last edited 1 day ago) (2 children)

Assuming the time between submersion and observation is greater than zero, increasing temperatures above boiling would give increasing error.

Conversely the physicist may get other error at/near freezing.

And yet another option is the fluid being above the Ball's melting and/or boiling point, assuming changes in density with phase change.

[–] cloudshouter@lemmy.zip 11 points 1 day ago

They just said the ball was red, they didn’t say why…

[–] Aqivex@fedinsfw.app 10 points 1 day ago (1 children)

All of which the physicist can trivially account for, control and variable test around, should the requested question be updated to require it.

The requested question did not include "In all possible scenarios", thus determining the volume of the sphere via physics calculation at the most average of conditions, is the most correct valid solution, absent further requirement parameters.

[–] untorquer@quokk.au 6 points 1 day ago* (last edited 1 day ago)

You're right in terms of grading a student's homework or whatever.

In research/publication/career these assumptions must be stated unless given.

But I was responding to:

The physicist’s answer would be correct anywhere, no matter the temperature or density of the fluid.

Which includes non-standard conditions.

[–] OwOarchist@pawb.social 13 points 1 day ago* (last edited 1 day ago)

Interestingly, the physicist's answer would always be correct, but not always consistent.

If the sphere is compressible, then air pressure will slightly affect its volume. And unless the thermal expansion rate of the sphere is zero, the amount of fluid displaced will also vary with temperature.

However, even if the physicist gets different answers in different environments, it's always still a correct answer, because they correctly measured the volume of the sphere at that time.