A Fountain that works with Hot Water. Experiment. 

I am going to build two versions of a fountain that works because the variation of pressure induced by hot water.
In the first version, the fountain works because the reduction of the pressure that happens when cooling a hot bottle. Because the pressure outside is bigger, the water gets into the bottle.
In the second version, the water goes out because the air inside gets hotter, it expands so the pressure inside increases so it pushes the water outside.
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