Liquid nitrogen
Nitrogen cooled below about −196°C into its liquid state, used as a colorless, odorless cryogenic coolant.
Sprinkle water on a very hot pan and the droplets ball up and float—the 'Leidenfrost effect.' Instant vaporization creates a steam cushion preventing direct contact. The same principle lets you briefly pour liquid nitrogen at −196°C on bare skin unharmed.
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