A cylinder full of water on a scale

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Heating a cylinder full of water on a scale does not change its weight significantly, as the mass remains constant despite the introduction of energy. While heating does cause the water to expand, this expansion may result in a slight buoyancy effect that could make the scale read a bit lighter, but this would be negligible. The energy added through heating is minimal in terms of mass change, requiring an impractically large amount of energy to register on a scale. Additionally, convection currents in the air around the cylinder might affect the scale reading, but the overall weight remains unchanged. Thus, the weight of the cylinder and water is essentially constant, ignoring any relativistic effects.
nargesh
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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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