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R-407C is a mixture of hydrofluorocarbons used as a refrigerant. It is a zeotropic blend of difluoromethane (R-32), pentafluoroethane (R-125), and 1,1,1,2-tetrafluoroethane (R-134a). Difluoromethane serves to provide the heat capacity, pentafluoroethane decreases flammability, tetrafluoroethane reduces pressure. [1] R-407C cylinders are colored ...
Supercooling is the cooling of a liquid below its freezing point without it becoming solid. Freezing point depression is when a solution can be cooled below the freezing point of the corresponding pure liquid due to the presence of the solute; an example of this is the freezing point depression that occurs when salt is added to pure water.
The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point. For example, water boils at 373 K; at room temperature (293 K) liquid water is termed "subcooled". Subcooled liquids are frequently used in refrigeration cycles, steam turbine cycles, and some rocket engines use subcooled ...
A long-running heat wave that has already shattered previous records across the U.S. persisted on Sunday, baking parts of the West with dangerous temperatures that caused the death of a ...
In 2022, 1 in 10 babies born in the U.S. were premature, an 8% increase since 2014 after a steady decline in the early 2010s. Babies born at less than 37 weeks of gestation are considered preterm ...
Two Ohio lawmakers were joined by an NFL players union representative on Tuesday in unveiling legislation to require the state’s professional sports teams to play on natural grass. The effort is ...
Mode (s) Single-player, multiplayer. Call of Duty: Roads to Victory is a 2007 World War II first-person shooter for the PlayStation Portable and a portable spin-off of Call of Duty 3 for consoles. [ 1] It was released on March 13, 2007, developed by Amaze Entertainment [ 2][ 3] and published by Activision Publishing. [ 4][ 5]
Mode (s) Single-player, multiplayer. Call of Duty: World at War is a 2008 first-person shooter game developed by Treyarch and published by Activision. It is the fifth main installment of the Call of Duty series and is the fourth entry in the series to be set during World War II. The game was announced by Activision in June 2008 and was released ...