A cylinder full of water on a scale

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SUMMARY

Heating a cylinder full of water on a scale does not change the weight displayed by the scale, assuming no water evaporates. While heating introduces energy into the system, which can be considered a form of mass, the amount of energy required to produce a measurable weight change is substantial. The expansion of the heated cylinder may cause slight buoyancy effects, potentially making it appear "lighter," but these changes are negligible. Overall, the weight remains constant, disregarding any relativistic effects.

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if we have cylinder full of water on a scale the we heat it, does the scale show any difference in weight of cylinder? water don't evaporate.
 
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I would say no. Heating a liquid does introduce energy into the cylinder and energy is really a form of mass (and the other way around), but you'd need a lot of energy to see it on a scale. And I mean a lot of energy.
 
The heated cylinder would expand, which due to buoyancy might cause it to be a little bit "lighter" according to the scale. You'd probably need a hell of a scale to pick this up.

There would be movement of air around the cylinder due to convection. I suppose that could also be picked up depending on the scale.

In any case, the actual weight of the cylinder would be unchanged neglecting relativistic effects.
 

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