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Liquid nitrogen shrinking a helium filled balloon
Posted by: petersplim
Video duration: 58 seconds
Global video hits: 37678
A helium-filled balloon is less dense than air and it can float upwards. When the balloon is shrunk by pouring liquid nitrogen over it, it becomes denser than air and falls to the ground.
Upon warming and expanding, it will fly up again.This video is produced in Singapore. More videos on www.plenrich.com
Related: balloon, helium, liquid, nitrogen
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PL students munching liquid nitrogen-cooled biscuits
Posted by: petersplim
Video duration: 243 seconds
Global video hits: 171
When very cold liquid nitrogen cools the humid air inside our mouth,condensed droplets of water form. They come out through our nostril as "smoke"
Related: liquid, lucia, nitrogen, petersplim, pl, plenrich, plsingapore, tabitha, ulindra, zhexuan
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