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1,1,1,2-Tetrafluoroethane (also known as norflurane (), R-134a, Klea 134a, Freon 134a, Forane 134a, Genetron 134a, Green Gas, Florasol 134a, Suva 134a, HFA-134a, or HFC-134a) is a hydrofluorocarbon (HFC) and haloalkane refrigerant with thermodynamic properties similar to R-12 (dichlorodifluoromethane) but with insignificant ozone depletion potential and a lower 100-year global warming ...
Thermal Conductivity at 25 °C vapor at 1 atm 0.0145 W/m·K (0.00836 Btu/hr·ft°F) Viscosity at 25 °C, liquid 0.202 mPa·S (cP) Viscosity at 25 °C, vapor at 1 atm 0.012 mPa·S (cP) Solubility in water at 25 °C and 1 atm 0.15% by weight Solubility of water in HFC-134a at 25 °C 0.11% by weight Flammability Limits in Air at 1 atm None
In mathematics, the infinite series 1 / 2 + 1 / 4 + 1 / 8 + 1 / 16 + ··· is an elementary example of a geometric series that converges absolutely. The sum of the series is 1. In summation notation, this may be expressed as
Zazzle was launched from their garage by Robert, Bobby, and Jeffrey Beaver, and went live in 2005. [5] The company received an initial investment of US$16 million in July 2005 from Google investors John Doerr and Ram Shriram, [3] and an additional investment of US$30 million in October 2007.
An example of 2 + 1 ⁄ 2-D processing, can be 2 + 1 ⁄ 2-D microextrusion, where, thanks to an optimal control of the process, the obtained extrudate, which is generally, but not always a tube, can have: Tapered profile, which means that diameters or characteristic dimensions, varies independently from each other.
1,1,2,2-tetrachloroethane was used in large amounts to produce other chemicals like trichloroethylene, tetrachloroethylene, and 1,2-dichloroethylene. [6] Because of its possible carcinogen effects on humans, the production of 1,1,2,2-tetrachloroethane has decreased significantly and is no longer widely used as an end-product. [7]
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