noble gas

noun

Definition of noble gas

: any of a group of rare gases that include helium, neon, argon, krypton, xenon, and usually radon and that exhibit great stability and extremely low reaction rates

called also inert gas

Examples of noble gas in a Sentence

Recent Examples on the Web Related Stories Beryllium, a brittle metal with atomic number 4, and helium, a noble gas with atomic number 2, are similar in ways that could influence the observation of the X17 particle anomaly in both elements. Caroline Delbert, Popular Mechanics, "The Fifth Force of Nature Could Be Real and Fantastic," 20 Nov. 2019 Radon is a noble gas that is a natural byproduct of the constant breakdown of uranium. Boston.com Real Estate, "What every homeowner should know about radon," 12 Nov. 2019 Scientists are hunting through macrofossils, leaf wax, mineral types, noble gases, and much more to answer questions about what Greenland’s ancient landscape looked like when it was last exposed. Paul Voosen, Science | AAAS, "Ancient soil from secret Greenland base suggests Earth could lose a lot of ice," 29 Oct. 2019 What kind of noble gases are trapped within the glass? Christine Smallwood, Harper's magazine, "Novel, Essay, Poem," 16 Sep. 2019 Along with rocks and soil, the drive tube brought back by Cernan and Schmitt contains a smidgeon of noble gases that were locked within the rocks and soil. Jason Davis, NBC News, "Apollo moon rocks may unlock more secrets about our solar system," 21 June 2019 In the moon's vacuum, atoms of noble gases such as argon and krypton will be captured in the aluminum. James R. Berry, Popular Mechanics, "Man's First Day on the Moon," 19 July 2019 The abundance of noble gases in the sample can help determine its age. Jason Davis, NBC News, "Apollo moon rocks may unlock more secrets about our solar system," 21 June 2019 From the top: Air is 78 percent nitrogen, just under 21 percent oxygen, and the rest is water vapor, CO2 and small concentrations of noble gases such as neon and argon. Ezra Dyer, Popular Mechanics, "Should You Really Put Nitrogen in Your Car Tires?," 19 Dec. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'noble gas.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of noble gas

1902, in the meaning defined above

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Time Traveler for noble gas

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The first known use of noble gas was in 1902

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Last Updated

28 Nov 2019

Cite this Entry

“Noble gas.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/noble%20gas. Accessed 19 January 2020.

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More Definitions for noble gas

noble gas

noun
no·​ble gas | \ ˈnō-bəl- How to pronounce noble gas (audio) \

Medical Definition of noble gas

: any of a group of rare gases that include helium, neon, argon, krypton, xenon, and sometimes radon and that exhibit great stability and extremely low reaction rates

called also inert gas

More from Merriam-Webster on noble gas

Britannica.com: Encyclopedia article about noble gas

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