There’s nothing particularly special about it…. it is just a lot colder than ice. Unlike water ice, it ‘melts’ directly back to a gas at normal pressure.
It’s dangerous if you touch it unprotected… it can give you frostbite. If it’s kept in a closed container it can cause an explosion as the gas expands. In a larger closed area it could fill a room with carbon dioxide and cause asphyxiation.
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