- Pour some liquid nitrogen into a pot of boiling water to make instant fog. Of course, you can get a much bigger effect if you add liquid nitrogen to a fountain or pool.
2. Place an inflated balloon in the nitrogen. It will deflate. Remove the balloon from the liquid nitrogen and watch it reinflate as it thaws out. An air-filled balloon will deflate and inflate, but if you use a helium balloon you can watch the balloon rise as the gas warms and expands.
3. Freeze a banana in liquid nitrogen. You can use it to hammer a nail.