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- Helium (36603 bytes)
104: ... are the lowest among the elements and it exists only as a [[gas]] except in extreme conditions. Extre...
112: ...aning it heats up when allowed to freely expand. Only below its [[Joule-Thomson inversion temperature]...
114: ... [[band system]]s, and HgHe, which is apparently only held together by polarization forces <!-- ref: '...
117: ...T] it is 50 times more compressible than water. Unlike any other element, helium will fail to solidif...
120: ... the lambda point, when it stops boiling and suddenly expands. The rate of expansion decreases below t...
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