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- Helium (36603 bytes)
95: | [[Helium-4|<sup>4</sup>He]]
104: ...sure]]. Its most abundant [[stable isotope]] is [[helium-4]] and its rare stable [[isotope]] is [[helium-3]]...
120: ...lambda point]] of 2.1768 kelvins, the [[isotope]] helium-4 exists in a normal colorless [[liquid]] state, ca...
158: ...contains some of the same information, since only helium-4 is produced by radioactive decay. Use of helium i...
170: ...yotr Leonidovich Kapitsa]] discovered that liquid helium-4 has almost no [[viscosity]] at temperatures near ...
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- List of elements by symbol (14812 bytes)
- Geology (12007 bytes)
- Age of the Earth (20052 bytes)
- Sun (20830 bytes)
- Planet (8450 bytes)
- Mercury (planet) (22924 bytes)
- Jupiter (24639 bytes)
- Saturn (planet) (23300 bytes)
- Uranus (15207 bytes)
- Neptune (planet) (18545 bytes)
- Hot air balloon (8769 bytes)
- Atom (12300 bytes)
- History of astronomy (13532 bytes)
- Earth's atmosphere (10093 bytes)
- Aviator (3951 bytes)
- Blimp (3839 bytes)
- Aircraft (13315 bytes)
- Chemical element (8169 bytes)
- Moon (37975 bytes)
- Berkelium (5697 bytes)
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