A simple experiment that to prove the potential energy is unlimited.

[overtaker]

Zhang,   If we don't understand, please explain in as much detail as possible.  Several sentences or paragraphs.  Thanks.

[Zhang Yalin]

If an alcohol lamp( the wick is 11 meters long and the wick is covered by  a plastic pipe) be dropped in a water pool 10 meters in depth,  then burn the alcohol out,  the empty shell will do work W0=GH, G=the weight of water of the same volume of alcohol, H=10 meters( it can be increased to 100 meters or more).
The chemical energy by burning alcohol can be used as well.  We need pay no extra energy to gain W0.

[Philip Hardcastle]

Zhang,

Are you saying the lamp is sealed?

So that it burns in a sealed vessel?

Phil

[Zhang Yalin]

No, the wick of it stretch to the surface of water.

[Philip Hardcastle]

So you are saying that the alcohol and wick are burnt and exhaust products are vented to the atmosphere, is that correct?