# A cylinder full of water on a scale

• nargesh
In summary, heating a cylinder full of water on a scale would not show a significant difference in weight. While energy is introduced into the cylinder through heating, it would require a large amount of energy to be detected on the scale. The expansion of the heated cylinder and movement of air around it due to convection may slightly affect the weight, but it would be negligible. Overall, neglecting relativistic effects, the weight of the cylinder would remain unchanged.
nargesh
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.

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.

## 1. How does the weight of the cylinder full of water on a scale compare to the weight of the empty cylinder?

The weight of the cylinder full of water will be greater than the weight of the empty cylinder. This is because the water adds additional mass to the cylinder, increasing its weight.

## 2. Why does the water level in the cylinder affect the weight on the scale?

The water level in the cylinder affects the weight on the scale because the weight of the water is added to the weight of the cylinder. This is due to the force of gravity acting on the mass of the water, which is then measured by the scale.

## 3. Will the weight on the scale change if the cylinder is filled with a different liquid?

Yes, the weight on the scale will change if the cylinder is filled with a different liquid. This is because different liquids have different densities, which will affect the weight of the cylinder when placed on the scale.

## 4. What happens to the weight on the scale when the water in the cylinder evaporates?

The weight on the scale will decrease as the water in the cylinder evaporates. This is because the water is no longer adding additional mass to the cylinder, resulting in a decrease in weight on the scale.

## 5. How does the temperature of the water in the cylinder affect the weight on the scale?

The temperature of the water in the cylinder does not affect the weight on the scale. This is because the weight of an object is determined by its mass, not its temperature. However, the density of water does change slightly with temperature, so there may be a small change in weight due to this factor.

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