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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.
Vapour-compression refrigeration or vapor-compression refrigeration system ( VCRS ), [ 1] in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air conditioning of buildings and automobiles. It is also used in domestic and commercial refrigerators, large-scale warehouses ...
Getty Images Choosing which 1040 tax form you need to file your return on can be a lot harder to figure out than you'd think, but answering just a few basic questions will lead you to the right ...
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The new Form 1040 replaced the three 1040 forms that were used in the past: the 1040, the 1040-A and the 1040-EZ. All U.S. taxpayers will now file Form 1040, U.S. Individual Income Tax Return.
It's important to note that you cannot use a form 1040-EZ or a form 1040A; you can read more about forms in the 1040 series here. Show comments. Advertisement. Advertisement. In Other News.
Superheating. In thermodynamics, superheating (sometimes referred to as boiling retardation, or boiling delay) is the phenomenon in which a liquid is heated to a temperature higher than its boiling point, without boiling. This is a so-called metastable state or metastate, where boiling might occur at any time, induced by external or internal ...