![]() The net weight of the fluid sample in grams equals the sample‘s density in pounds per U. The Midget Cup has a capacity of 8.32 grams of water at 25☌. This weight per gallon is multiplied by 0.12 to obtain a specific gravity or the net weight of the cup can be divided by 83.2 for a direct conversion to specific gravity. The net weight in grams of the fluid sample is divided by 10 to obtain the weight in pounds per U. The Regular Cup contains 83.2 grams of water at 25☌. Using the net weight, compute the pounds-pergallon density or the specific gravity of the sample by the following methods.The weight of the tare equals the exact weight of the empty cup and its lid. It can be used as a counterpoise to determine rapidly the net weight of the sample when an evenarm or trip balance is used. A tare weight is available with the 3 sizes of cups. Weigh the properly filled cup, (usually to the nearest 0.1 gram), on an appropriate laboratory balance.Wipe off this excess material, using a soft cloth or tissue paper. An excess of the liquid should ooze (not squirt) put of the small hole on top of the snugly fitting lid. Place the perforated lid on top of the cup and seal it with a careful twisting motion.Avoid trapping air bubbles in the sample. Fill the cup until the liquid level is just below the rim at 25☌ or other agreed upon temperature. Mix the material thoroughly before pouring a representative sample into the cup.These corrosion resistant stainless steel cups are available in 3 sizes: Regular, Midget and Imperial. The net weight of the air-free sample is determined to the nearest 0.1 gram, and converted by simple factors to either density (pounds per gallon) or specific gravity (density relative to water). The BYK-Gardner Weight Per Gallon Cup is a simplified form of pycnometer specially designed to measure the density of a fluid at a standard temperature of 77☏ (25☌).
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