liquid nitrogen

That gives a reading of how much liquid nitrogen is left.

I thought they had to use liquid nitrogen for reasons of precision.

I suspect it would be hard to make liquid nitrogen as widely available.

Not much, but it was a lot better than liquid nitrogen.

In the food industry, liquid nitrogen is used to freeze foods quickly.

Guess it must have been something like liquid nitrogen after all.

It reminded him of two hundred years spent waiting in liquid nitrogen.

I am wondering how scientists get liquid nitrogen so cold?

"What if a ship did crash through into liquid nitrogen?"

Find someone who has watched a science experiment with liquid nitrogen.