I did it with water. It was a hassle though. I did it to see what will happen.

Pretty much everything can be a solid, liquid and gas state. How do they decide what is allowed and what isn't? For example if you take keys through, the metal can be melted to a liquid. Will they take our house keys from us because at the time they are in a solid state and where once in a liquid state?

Unless there is a rule saying things that are liquid at room temperature?