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The Most Bizarre Substance Known to Science and What It Can Do
If ever there was a criminally underrated natural resource, it would
have to be Helium. Though most commonly associated with party balloons
and making one’s voice sound like a cartoon, Helium’s most important
application is in cooling the magnets of Magnetic Resonance Imaging or
MRI machines. While the finite and ever-dwindling global supply of this
vitally important gas is a topic worthy of its own video, perhaps even
more fascinating is just how bizarre an element Helium truly is. For if
Helium is liquefied and cooled to a low enough temperature, it begins to
behave like no other liquid on earth, seemingly violating the laws of
gravity, thermodynamics, and even logic itself. This is the story of
superfluid Helium II, the weirdest substance known to science.
In order for Helium to be liquefied, it must be cooled to a temperature
of -268.8 degrees Celsius or 4.2 Kelvin – that is, only 4.2 degrees
above Absolute Zero, the coldest temperature theoretically possible. By
contrast, Nitrogen liquefies at a relatively balmy 77 Kelvin, Oxygen at
54 Kelvin, and Hydrogen at 33 Kelvin. The reason Helium is so difficult
to liquefy lies in its electron orbitals being completely filled, making
it – like the other noble gases Neon, Argon, Krypton, Xenon, and Radon –
electrically neutral and chemically inert. This means that the only
force which can pull Helium atoms together is the so-called Van de Waals
Force, which is caused by electrons shifting from one side of an atom
to the other and creating a momentary electrostatic charge. This force
is incredibly weak, meaning that Helium must be cooled to extremely low
temperatures in order for the Van de Waals forces to overcome the energy
of the moving atoms and pull them close enough together for the gas to
liquefy. Solidifying Helium is even more difficult – so difficult, in
fact, that it cannot be done at regular atmospheric pressures. Only at
pressures of 25 atmospheres and above can solid Helium be created.
Learn more about your ad choices. Visit megaphone.fm/adchoices
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By Cloud10
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13701,370 ratings
If ever there was a criminally underrated natural resource, it would
have to be Helium. Though most commonly associated with party balloons
and making one’s voice sound like a cartoon, Helium’s most important
application is in cooling the magnets of Magnetic Resonance Imaging or
MRI machines. While the finite and ever-dwindling global supply of this
vitally important gas is a topic worthy of its own video, perhaps even
more fascinating is just how bizarre an element Helium truly is. For if
Helium is liquefied and cooled to a low enough temperature, it begins to
behave like no other liquid on earth, seemingly violating the laws of
gravity, thermodynamics, and even logic itself. This is the story of
superfluid Helium II, the weirdest substance known to science.
In order for Helium to be liquefied, it must be cooled to a temperature
of -268.8 degrees Celsius or 4.2 Kelvin – that is, only 4.2 degrees
above Absolute Zero, the coldest temperature theoretically possible. By
contrast, Nitrogen liquefies at a relatively balmy 77 Kelvin, Oxygen at
54 Kelvin, and Hydrogen at 33 Kelvin. The reason Helium is so difficult
to liquefy lies in its electron orbitals being completely filled, making
it – like the other noble gases Neon, Argon, Krypton, Xenon, and Radon –
electrically neutral and chemically inert. This means that the only
force which can pull Helium atoms together is the so-called Van de Waals
Force, which is caused by electrons shifting from one side of an atom
to the other and creating a momentary electrostatic charge. This force
is incredibly weak, meaning that Helium must be cooled to extremely low
temperatures in order for the Van de Waals forces to overcome the energy
of the moving atoms and pull them close enough together for the gas to
liquefy. Solidifying Helium is even more difficult – so difficult, in
fact, that it cannot be done at regular atmospheric pressures. Only at
pressures of 25 atmospheres and above can solid Helium be created.
Learn more about your ad choices. Visit megaphone.fm/adchoices
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