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During the last years of his life he worked steadily on the wave mechanics of the hydrogen and helium atom.
Ramsay realized that argon and helium might be members of a hitherto unsuspected new group in the Periodic Table.
Over the next few years many types of laser were built, some using a mixture of helium and neon, others carbon dioxide or organic dyes.
At launch, the balloon is partially inflated with helium and expands as it rises.
Today, balloons in Japan are lifted by hot air rather than the more expensive helium or hydrogen.
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