In my grade 2 science classes, I have been teaching about the three phases of matter: solid, liquids and gases, and how to change the state of the matter between them.
The past two weeks have been very cold in Midland. One afternoon when it was abou -20C, I conducted a demonstration with several of my classes.
While the children watched from the window, I took a kettle of boiling water outdoors and tossed it into the air. The near boiling water began to turn into steam and immediately flash froze in a puff of white steam and ice crystals. For it to work you need a very cold day (below -20C and very hot, almost boiling water).
*Caution: Don’t try this without an adult. You could scald yourself with the boiling water before it freezes. Be careful that the wind is not blowing back towards you.