E939 has various meanings in the Scientific & Educational category. Discover the full forms, definitions, and usage contexts of E939 in Scientific & Educational.
A non-inflammable lifting gas tor lighter-than-air craft. Element 2, atomic weight 4.0026. A colorless, odorless, inert gas, first discovered in theemission spectrum of the sun in 1868. Symbol:"He" Atomic Number:"2" Atomic Mass: 4.00amu. Helium is a very non-reactive element. It is the first in the group of noble or inert gases. You can find it in balloons, scuba tanks, lasers, nuclear reactors, and blimps.
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