The first threw the sodium piece into the water and it exploded as soon as it came into contact with the water. The second is a method of boiling coffee with sand, used in the Arabian desert and hot regions, where the temperature of the sand rises tremendously, and the movement of the pot inside it gives it a high temperature sufficient to boil the coffee. The third one put three liquids of different densities in a cup (oil, mercury and water) and threw different pieces of varying degrees of influence from Archimedes’ force, and these points were fixed in areas suitable for their concentration. If you like the video, don't forget to like and subscribe to receive all that is new.
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