Yeah, liquid nitrogen is not that expensive despite how exotic it sounds.
But it really does need to be handled appropriately. For example, while you can put it in a simple thermos flask you shouldn't be in small enclosed spaces with it. IE elevator/car.
The liquid expands to quite a lot of gas and might force out all the standard air taking the oxygen with it.
But mainly it is about 'freeze burns'.
My wife(science lab manager) cringes at the lack of safety glasses and gloves at the ice cream shop.
They plonk ingredients into an open top mixer/blender and then pour the liquid nitrogen in while it is running!
But it really does need to be handled appropriately. For example, while you can put it in a simple thermos flask you shouldn't be in small enclosed spaces with it. IE elevator/car.
The liquid expands to quite a lot of gas and might force out all the standard air taking the oxygen with it.
But mainly it is about 'freeze burns'.
My wife(science lab manager) cringes at the lack of safety glasses and gloves at the ice cream shop.
They plonk ingredients into an open top mixer/blender and then pour the liquid nitrogen in while it is running!
Edit: tweaked wording.