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Learn how Clark Planetarium can freeze a fresh flower in seconds!

Posted at 1:55 PM, Jan 04, 2022
and last updated 2022-01-04 15:55:55-05

Cynthia Checketts with Clark Planetarium says liquid nitrogen is almost as cold as the planet Pluto!

She explains that nitrogen is usually a gas at room temperature.

But, she can make it liquid by decreasing the temperature to almost -320 degrees Fahrenheit!

With someone so cold, she showed us how things like fresh flowers can instantly freeze. Even puffy marshmallows are hard enough to break with a hammer after a few seconds.

Cynthia says, because it's so cold... it only takes a little bit to heat it up to the boiling point, as she proved when she put the liquid nitrogen into a tea kettle. It started to whistle right away!

You can see more fun science experiments like this in person at Clark Planetarium, or by visiting their website,