Comparing E939 - Helium vs E946 - octafluorocyclobutane
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Popular questions
Where does helium come from?
On Earth it’s produced by the radioactive decay of uranium and thorium and is commercially extracted from certain natural gas fields by cryogenic separation.
Is helium flammable?
No—helium is non-flammable and chemically inert.
How long do helium balloons last?
Typical latex helium balloons float for about 8–12 hours (longer if treated), while foil/Mylar balloons often last 3–7 days or more depending on size and temperature.
How many valence electrons does helium have?
Two; its 1s shell is full, which is why helium is very inert.
What is helium used for?
As E939 it’s used as an inert packaging gas to displace oxygen and protect foods; more broadly, helium is used for lifting balloons, cryogenics (e.g., MRI), leak detection, pressurizing, and as a shielding gas in welding.
Tetrafluoroethylene can be converted to octafluorocyclobutane which can be use?
A non-flammable propellant gas (E946) in food aerosols, and in some cases as an inert packaging gas.
Tetrafluoroethylene, c2f4, can be converted to octafluorocyclobutane which can be used as a?
Propellant gas in food aerosols (E946), and occasionally as an inert packaging gas.