单词	molecular weight
释义	molecular weight noun : the average mass of a molecule of a compound compared to ¹/₁₂ the mass of carbon 12 and calculated as the sum of the atomic weights of the constituent atoms Example Sentences Recent Examples on the Web 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 Aside from being highly durable thanks to a polyethylene with ultra high molecular weight, the fabric is DWR-treated and completely waterproof. Outside Online, 23 June 2022 The Hyaluronic Acid Serum is $90, and a multi-molecular weight hyaluronic acid serum that provides 72-hours of moisturizer, reducing dehydration and fine lines. Allyson Portee, Forbes, 1 July 2022 This ultra hydrating serum is formulated with mixed molecular weight hyaluronic acid and niacinamide to plump and rejuvenate the skin, reduce fine lines, increase skin firmness, and improve elastin production. Cécilia Pelloux, Forbes, 2 June 2022 From there, the researchers took tiny quantities of each beer and used two mass spectrometers (a tool that helps scientists measure a sample's exact molecular weight) to perform a chemical analysis in two different ways. Caroline Delbert, Popular Mechanics, 27 Aug. 2021 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 Honorable mention in the senior division was won by John Bernardin of Fallbrook Union High School for a colorimetric chemical analysis exhibit, and Lulu Capra of Fallbrook for a display showing how to measure molecular weight. Merrie Monteagudo, San Diego Union-Tribune, 16 Apr. 2021 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 See More Word History First Known Use 1860, in the meaning defined above Medical Definition molecular weight noun : the mass of a molecule that may be calculated as the sum of the atomic weights of its constituent atoms
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