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About Helium

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Helium
Product Name:   Helium
Synonyms:   Add
CAS RN.:   71086-78-7;7440-59-7
EINECS:   275-187-7
Molecular Weight:   4.002602
Molecular Formula:   He
Density:   0.1785（0℃）
Melting Point(℃):   -272.3℃
Boiling Point(℃):   -268.9℃
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Helium
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