Is Helium Flammable? (Why?)

No, helium is not flammable. In fact, helium is considered an inert gas because it is very stable and unreactive with other substances under normal conditions. ¹

Well, this was just a simple answer. But there are few more things to know about this topic which will make your concept super clear.

So let’s dive right into it.

Why is helium not flammable?

Helium is not flammable because it is a noble gas and has a completely filled outer electron shell. This makes helium very stable and unreactive with most other substances, including oxygen, which is required for combustion to occur. ²

In order for a substance to be flammable, it must be able to react with oxygen in the presence of heat or a spark, causing a combustion reaction that releases energy in the form of heat and light. 

However, helium does not react with oxygen or other substances in a way that could cause combustion. ³

The reason for this is that helium’s outer electron shell contains two electrons, which is the maximum number of electrons it can hold. ⁴

This makes helium very unreactive, as it has no tendency to gain or lose electrons and form chemical bonds with other elements.

Overall, helium’s stable electronic configuration and unreactivity with other substances make it a safe and non-toxic gas that does not pose a fire or explosion hazard. ⁵

Is liquid helium flammable?

No, liquid helium is not flammable. Like its gaseous form, liquid helium is a non-flammable and inert substance that does not react with other substances in a way that could cause combustion or explosion. ⁶

Liquid helium is a highly specialized substance that is used in a variety of scientific and technological applications, such as cooling superconducting magnets in MRI machines and particle accelerators, and as a coolant for rocket fuel systems and other high-performance applications. ^{7 8}

Liquid helium is extremely cold, with a boiling point of just 4.2 Kelvin (-268.9 °C), which makes it an effective coolant for a wide range of applications. ⁹

However, its low boiling point and extremely low temperature mean that it can be hazardous to handle, and proper safety precautions must be taken when working with liquid helium to prevent injury or exposure to extremely low temperatures. ¹⁰

Overall, while liquid helium can be a hazardous substance if mishandled, it is not a flammable substance and does not pose a fire or explosion hazard.

Difference between helium and other flammable gases

The main difference between helium and other flammable gases is that helium is a noble gas with a completely filled outer electron shell, making it very stable and unreactive with other substances. 

This means that helium does not undergo combustion reactions and is not flammable, even in the presence of oxygen and a spark or heat source.

On the other hand, other flammable gases such as hydrogen, methane, propane, and butane have partially filled outer electron shells and are therefore much more reactive with other substances. ^{11 12}

When these gases are exposed to oxygen and a source of heat or spark, they can undergo combustion reactions that release energy in the form of heat and light, making them highly flammable and potentially explosive.

Overall, the main difference between helium and other flammable gases is their reactivity and potential for combustion. 

Helium is a stable and non-flammable gas, while other gases are highly reactive and can pose a fire and explosion hazard if not handled properly.

Can helium explode with heat?

No, helium cannot explode with heat. Helium is a non-flammable gas that does not react with oxygen or other substances in a way that could cause combustion or explosion.

In order for an explosion to occur, a combustible substance must come into contact with a source of heat or spark in the presence of oxygen. 

However, helium is an inert gas that is chemically stable and does not react with oxygen, even at high temperatures.

Helium has a boiling point of -268.9 °C, which means that it is a gas at room temperature and pressure. ¹³

As a gas, helium does not have a fixed shape or volume, and it can easily diffuse and disperse into the atmosphere without accumulating in one place.

Overall, helium is a safe and non-toxic gas that does not pose a fire or explosion hazard, even when exposed to high temperatures. 

Further reading

Is Chlorine Flammable?
Is Helium a Metal?
Is Helium Diatomic?
Is Lithium a Metal or Nonmetal?
Why is Boron a Metalloid?

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Jay Rana

Jay is an educator and has helped more than 100,000 students in their studies by providing simple and easy explanations on different science-related topics. He is a founder of Pediabay and is passionate about helping students through his easily digestible explanations.

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1. Rosenthal, G. A. (n.d.). HELIUM. HELIUM. https://www.uky.edu/~garose/helium
2. No. 3246: Helium, The Up-Lifting Element. (n.d.). No. 3246: Helium, the Up-Lifting Element. https://www.uh.edu/engines/epi3246.htm
3. The Chemistry of Hydrogen. (n.d.). The Chemistry of Hydrogen. https://chemed.chem.purdue.edu/demos/main_pages/10.1.html
4. s Atomic Orbitals. (2013, October 2). Chemistry LibreTexts. https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Quantum_Mechanics/09._The_Hydrogen_Atom/Atomic_Orbitals/s_Atomic_Orbitals
5. BLM.gov https://www.blm.gov/sites/blm.gov/files/Helium%20Fast%20Facts_508.pdf
6. US GOV, N. O. (n.d.). HELIUM, REFRIGERATED LIQUID (CRYOGENIC LIQUID) | CAMEO Chemicals | NOAA. HELIUM, REFRIGERATED LIQUID (CRYOGENIC LIQUID) | CAMEO Chemicals | NOAA. https://cameochemicals.noaa.gov/chemical/3548
7. Keeping An Eye on the Potential Shortage of Helium for MRIs. (2023, January 25). Helium Shortage for MRI | RSNA. https://www.rsna.org/news/2023/january/helium-shortage-for-MRI
8. Investigation of helium injection cooling to liquid oxygen propellant chamber. (2006, January 4). Investigation of Helium Injection Cooling to Liquid Oxygen Propellant Chamber – ScienceDirect. https://doi.org/10.1016/j.cryogenics.2005.11.002
9. hyperphysics.phy-astr.gsu.edu http://hyperphysics.phy-astr.gsu.edu/hbase/lhel.html
10. NJ.gov https://nj.gov/health/eoh/rtkweb/documents/fs/0972.pdf
11. UNL.edu https://ehs.unl.edu/sop/s-hazards_flam_gases_liq_aeros_risk_min.pdf
12. Compressed Gas: Toxic and Hazardous Gas Classifications. (2022, April 15). Compressed Gas: Toxic and Hazardous Gas Classifications. https://blink.ucsd.edu/safety/research-lab/chemical/gas/toxic.html
13. Helium | Encyclopedia.com. (2018, May 17). Helium | Encyclopedia.com. https://www.encyclopedia.com/science-and-technology/chemistry/compounds-and-elements/helium