Density
0.125 g/cm³ (liquid at melting point)
Discovery
Discovered by Sir William Ramsay in 1895.
Common Uses
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Used in cryogenics and MRI machines
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Provides lift in balloons and airships
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Used as a cooling medium in nuclear reactors
Interesting Facts
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Helium is the second most abundant element in the universe.
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It is chemically inert and non-reactive under most conditions.
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It gradually escapes Earth’s atmosphere due to its low atomic weight.
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