there is a similar inverse process for hot water as well... if you take a very very clean and perfectly smooth surfaced (on the inside) cup/glass and microwave

there is a similar inverse process for hot water as well... if you take a very very clean and perfectly smooth surfaced (on the inside) cup/glass and microwave it to just before the point of boiling, then drop anything into it (sugar, coffee, a teaspoon... pretty much anything) it will very energetically, instantly boil.. often vertically... be careful performing this experiment. Edit: here this will help explain it https://www.animations.physics.unsw.edu.au/jw/superheating.htm https://www.animations.physics.unsw.edu.au/jw/superheating.h...