po·​ros·​i·​ty | \ pə-ˈrä-sə-tē How to pronounce porosity (audio) , pȯ- \
plural porosities

Definition of porosity

1a : the quality or state of being porous
b : the ratio of the volume of interstices of a material to the volume of its mass
2 : pore

Examples of porosity in a Sentence

Recent Examples on the Web Diameter and thickness of the fibers, as well as porosity (the ratio of open space to fibers) play a role in how well a filter collects particles. USA Today, 7 Jan. 2022 Today, Grant has developed a treatment that works for her high porosity, medium to low density, Type 4 hair and its fine strands. Angelique Jackson, Variety, 2 Dec. 2021 Because the aluminum casting process suffers from porosity—which creates weak points—the wheels require more material and designs are limited to large, simple elements. Matt Crisara, Popular Mechanics, 27 Oct. 2021 Unlike traditional gravity casting’s porosity, these machines can achieve nearly 100 percent material density. Matt Crisara, Popular Mechanics, 27 Oct. 2021 Hayabusa2 found that Ryugu also lacks fine regolith and has high-porosity rocks, says the agency. Bruce Dorminey, Forbes, 22 Oct. 2021 In a time when everyone is talking about porosity and curl types, the Chicago Med alum doesn't overcomplicate her hair care. Paulina Jayne Isaac, Glamour, 28 Sep. 2021 More specifically, my hair is very, very low porosity. Ashley Abramson, Allure, 11 Aug. 2021 Pre-poo, deep condition, high vs. low porosity – all that was gibberish to younger Janae, who was used to getting a Brazilian blowout every three weeks and avoiding the rain like it was cursed. Janae Mckenzie, Glamour, 14 July 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'porosity.' 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 porosity

14th century, in the meaning defined at sense 1a

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The first known use of porosity was in the 14th century

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Last Updated

9 Jan 2022

Cite this Entry

“Porosity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/porosity. Accessed 18 Jan. 2022.

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More Definitions for porosity


po·​ros·​i·​ty | \ pə-ˈräs-ət-ē, pō-, pȯ- How to pronounce porosity (audio) \
plural porosities

Medical Definition of porosity

1a : the quality or state of being porous
b : the ratio of the volume of interstices of a material to the volume of its mass
2 : pore

More from Merriam-Webster on porosity

Britannica English: Translation of porosity for Arabic Speakers

Britannica.com: Encyclopedia article about porosity


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