Will liquid nitrogen melt all types of metals?

Nah… It'll even freeze mercury way past its freezing point. Don't get confused. A boiling substance does not necesarrily mean that it's hot. Water boils at 100°C but ethanol boils at 78°C. Liquid nitrogen boils at -196°C. read more

I’m confident that reference to the melting points of metals and the boiling point of nitrogen will suggest lots of examples of metals with melting point above the boiling point of nitrogen. read more

As far as melting goes, the resistance of current flowing through the metal generates heat. With small batteries, the kinds that are used in demonstrations, this might not be enough to melt the metal. read more

Liquid nitrogen readily evaporates to form gaseous nitrogen, and hence the precautions associated with gaseous nitrogen also apply to liquid nitrogen. For example, oxygen sensors are sometimes used as a safety precaution when working with liquid nitrogen to alert workers of gas spills into a confined space. read more