I had an idea of filling a small pipe that was capped at the bottom with mercury. I put a ball valve on the top so I could close it up and trap the mercury inside the pipe.
The contraption was put in ice water with salt in it so I could subcool the entire thing.
I then closed the ball valve and placed the mercury-filled pipe inside a clear, one gallon container of hot water.
The idea was to show how mercury expands and was supposed to rupture the pipe. Just like over-heating a bulb-type thermometer will cause the glass to shatter, or how water freezing in a pipe breaks pipe fittings, I hoped this experiment would show that in real time.
I put it in the hot water and nothing happened.