How to Use molecular weight in a Sentence

molecular weight

noun
  • Even the protein’s molecular weight isn’t pinned down.
    — Sara Talpos — Undark, STAT, 1 June 2026
  • That’s a more buoyant air mass, and that’s due to the molecular weight of a wet air mass versus a dry one.
    — Chris Bianchi, The Denver Post, 3 Aug. 2019
  • But its effectiveness is very much down to the molecular weight used.
    — Ellie Davis, Vogue, 11 June 2026
  • But hydrogen is a wily gas, with a molecular weight as light as molecules come.
    — IEEE Spectrum, 31 July 2014
  • So, all small molecules have low molecular weight, but not all small molecules are drugs by any means.
    — Caroline Delbert, Popular Mechanics, 6 July 2021
  • Their results showed that the brown algae extract, which had the lowest molecular weight, did the best.
    — Sarah Jacoby, SELF, 13 Aug. 2019
  • The story of the layers is told by the molecular weight of the elements contained in them.
    — Yereth Rosen, Alaska Dispatch News, 24 Sep. 2017
  • But what stuck out to me was that the protein is not easily absorbed into skin due to its high molecular weight.
    — Kiana Murden, Vogue, 21 Mar. 2025
  • This serum utilizes three types of hyaluronic acid with different molecular weights.
    — Danielle Cohen, Glamour, 10 Apr. 2024
  • It’s paired with eight molecular weights of hyaluronic acid as well as panthenol, which conditions and softens skin.
    — Deanna Pai, Vogue, 14 Oct. 2025
  • Hydrolyzed soy protein is made of low molecular weight peptides, which are highly digestible.
    — Amber Smith, Discover Magazine, 23 Oct. 2022
  • Dyneema, which is an ultra-high molecular weight polyethylene, is now used in Levi’s.
    — Steff Yotka, Vogue, 3 Apr. 2018
  • At high molecular weights, the liquid form of the hydrocarbon would be too viscous for droplets to form readily.
    — IEEE Spectrum, 5 Nov. 2014
  • The new wetsuits that worked best were made of strong and light fiber that is often used to make sailing rope and ultra-high molecular weight polyethylene.
    — Laura Baisas, Popular Science, 24 Sep. 2025
  • Most new antibiotics are small molecules—those that have molecular weights of less than 600 daltons.
    — Beth Mole, Ars Technica, 5 Jan. 2024
  • The team could measure this aboard the aircraft with a device called a mass spectrometer, which calculates molecular weight.
    — Matt Simon, Wired, 3 Nov. 2020
  • But Fuster said low molecular weight heparin and apixaban both showed positive effects.
    — Maggie Fox, CNN, 26 Aug. 2020
  • Cat dander has a very light molecular weight -- think invisible, microscopic dust blowing through the house.
    — Annie Lane, cleveland, 30 Nov. 2022
  • As far as hyaluronic acid goes, topical products with varying molecular weights can improve hydration.
    — Ellie Davis, Vogue, 11 June 2026
  • The components are separated based on their molecular weight, size, and density.
    — Suchandrima Bhowmik, Health, 8 Aug. 2024
  • It's got hydrolyzed proteins, which are made up of low molecular weight peptides that can be absorbed in the stomach with less risk of producing an immune response.
    — Amber Smith, Discover Magazine, 23 Oct. 2022
  • Two molecular weights of hyaluronic acid lead the formula to replenish the skin's moisture levels and reveal a bouncier complexion.
    — Lauren Valenti, Vogue, 12 Jan. 2024
  • That’s because glycerin’s low molecular weight (92 daltons, to be exact) can penetrate deeper into the skin.
    — Elise Tabin, Harper's BAZAAR, 14 Mar. 2023
  • Small molecule drugs are made of chemicals that have low molecular weight, while biologic medicines are derived from living sources such as animals or humans.
    — Annika Kim Constantino, CNBC, 15 Aug. 2024
  • What separates these drops from the crowd is the inclusion of niacinamide and dual molecular weight hyaluronic acid, which pull their weight to even the skin tone, smooth over fine lines and give the skin a more youthful glow.
    — Alyssa Brascia, Peoplemag, 24 Aug. 2022
  • What separates these drops from the crowd is the inclusion of niacinamide and dual molecular weight hyaluronic acid, which pull their weight to even the skin tone, smooth over fine lines, and give the skin a more youthful glow.
    — Alyssa Brascia, Peoplemag, 30 Jan. 2024
  • The scientists found that people with Parkinson’s have certain lipids of high molecular weight in their sebum—an oily substance found on the skin—that are more active, per a statement.
    — Margaret Osborne, Smithsonian Magazine, 12 Sep. 2022
  • Each has a different molecular weight, so the product can instantly revive dry, parched skin and provide additional moisture throughout the day (or night).
    — Devon Abelman, Allure, 12 Aug. 2024
  • At low molecular weights, these hydrocarbons are either gases, liquids, or soft solids, much too weak to withstand the rigors of the rocket’s combustion chamber.
    — IEEE Spectrum, 5 Nov. 2014
  • The Flush Balms leave behind a hydrated, dewy-yet-natural finish thanks to microfine pigments and a low molecular weight emollient that doesn't clog pores or feel heavy.
    — Kayla Blanton, Peoplemag, 23 Jan. 2023

Some of these examples are programmatically compiled from various online sources to illustrate current usage of the word 'molecular weight.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

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