International Physicists' Tournament 2020 IPT connect | IPT2020
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11. Flat fog

After pouring liquid nitrogen into a mug, you will notice that the mug starts to cast a mist. The mist’s border is a clearly marked thin plane at a certain height from the mug. Investigate the phenomenon.

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France

6.33

Russia

7.00

MEAN

6.33

7.00

0.00