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  2. 2,3,3,3-Tetrafluoropropene - Wikipedia

    en.wikipedia.org/wiki/2,3,3,3-Tetrafluoropropene

    2,3,3,3-Tetrafluoropropene, HFO-1234yf, is a hydrofluoroolefin (HFO) with molecular formula CH 2 =CFCF 3. Its primary application is as a refrigerant with low global warming potential (GWP). [1][2] As a refrigerant, it is designated R-1234yf[1] and marketed under the names Opteon YF by Chemours and as Solstice YF by Honeywell. [3]

  3. 1,1,1,2,3,3,3-Heptafluoropropane - Wikipedia

    en.wikipedia.org/wiki/1,1,1,2,3,3,3...

    [3] Due to its high GWP, the HFC-227ea has been included in the list of controlled substances of the Montreal Protocol (2016 Kigali amendment, in effect in January 2019). [ 4 ] Under EU regulations, production, imports and sales of HFC-227ea in spray cans such as freeze sprays or dusters have been prohibited since 2014, as the GWP is over the ...

  4. Equals sign - Wikipedia

    en.wikipedia.org/wiki/Equals_sign

    The equals sign (British English) or equal sign (American English), also known as the equality sign, is the mathematical symbol =, which is used to indicate equality in some well-defined sense. [1] In an equation , it is placed between two expressions that have the same value, or for which one studies the conditions under which they have the ...

  5. Our tech writer's pick for best budget earbuds are 50% off ...

    www.aol.com/lifestyle/our-tech-writers-pick-for...

    When reviewing these headphones, Broida flagged that the Baseus "case can recharge the earbuds more than 16 times before needing to be recharged itself. And the earbuds last up to eight hours ...

  6. AirPods Pro - Wikipedia

    en.wikipedia.org/wiki/AirPods_Pro

    Apple announced AirPods Pro on October 28, 2019, and released them two days later on October 30, 2019. [7] They include features of standard AirPods, such as a microphone.. They also have noise cancellation to reduce exterior sounds background noise, accelerometers and optical sensors that can detect presses on the stem and in-ear placement, and automatic pausing when they are taken out of the ea

  7. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [1]

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