What happens when you mix ping pong balls with liquid nitrogen?

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HONG KONG: On the face of it mixing ping pong balls and liquid nitrogen sounds pretty boring – but think again.
For as this video shows, the results of combining the two has dramatic results and it’s worth noting you shouldn’t be trying this at home.
Scientists at Plymouth University have staged such an experiment, placing liquid nitrogen into a container filled with 1,650 ping pong balls, to inspire people about the power of science.
Led by Dr Roy Lowry, Associate Professor in Physical Chemistry, the experiment begins when a canister of liquid nitrogen is placed into a plastic bin containing warm water.
As balls are poured on top, the chemical heats up and at its boiling point of -196˚C (-320˚F) it creates eye-catching consequences.
The ping-pong balls are fired high into the air, as can be seen on this video of the experiment, which scientists hope will ignite public imagination with regard to other areas where science impacts on everyday life.