Science with Dr. Bob: Making Ice Cream with Liquid Nitrogen

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BANGOR, Maine (WABI) In Today's Science with Bob, we are making ice cream with liquid nitrogen!

Nitrogen gas can be compressed and cooled into a useful liquid.

Liquid nitrogen is -321 degrees F. This is only 140 degrees above absolute zero!

We can "flash freeze" liquids in liquid nitrogen.

Good ice cream has tiny ice crystals - the tinier the better!

Flash freezing makes for great ice cream because the ice crystals are tiny!

Although nitrogen is harmless, liquid nitrogen is so cold it can give instant frostbite as well as exclude oxygen as it expands. It can cause anoxia if breathed in too high of a concentration.

For more information on the topics Dr. Bob discusses, you can visit his website at