The Elements: Helium

The video explains nuclear fusion, which forms helium atoms and generates heat and light. Helium is abundant in the universe but rare on Earth due to its lightness, causing it to escape into space. It has the lowest melting and boiling points, making it useful as a coolant in nuclear reactors and MRI scans. Helium is also used to pressurize rocket fuel tanks and in scuba diving mixtures to withstand high pressures.

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