![]() Fill the same specific gravity bottle with the desired liquid sample up to the brim.Then, weigh it on a weighing balance and note down its weight as Put on the lid and wipe the outer surface of the bottle with absorbent paper or tissue paper. Fill the same specific gravity bottle with distilled water up to its brim.Take a clean specific gravity bottle and note down its weight as W1.S is the specific gravity of the liquid substance.Note down the reading on the hydrometer as.Dip hydrometer in the sample and let it float freely.Take the liquid sample in a clean empty beaker up to the half.If reference substance is water, then its density is 1.0 g/cm 3. ![]() Specific gravity = Density of substance/ Density of reference substance Calculate the density of the solid substance from the method illustrated in the experiment ( DETERMINATION OF DENSITY OF FOODS).Those with an SG less than 1 are less dense than reference substance and will float on it. Those with SG greater than 1 are denser than reference substance and will sink. Substances with a specific gravity of 1 are neutrally buoyant. Specific gravity of solids is calculated by use of a weighing balance. Both methods are used to measure specific gravity of liquids. Specific gravity of a substance is measured by two means: By hydrometer and by specific gravity bottle. At a same given volume, specific gravity is the ratio of the mass of a substance to the mass of a reference substance. Principle: Specific gravity is the ratio of the density of a substance to the density of a reference substance. Apparatus: 100 mL Measuring cylinder, 100 mL Beaker.All the values noted down must be accurate.ĭETERMINATION OF SPECIFIC GRAVITY OF FOODSĪim: To determine the specific gravity of the given food samples.The experiment must be done in a constant temperature and pressure area.Clean the apparatus used in the experiment thoroughly with dilute nitric acid and then with acetone and then with distilled water thrice.Density of the liquid food can be calculated as.Calculate the difference between W2 and W1 and note down as W, it is the actual weight of the liquid sample.Now, weigh it on a weighing balance and note down its weight as W2. Fill this empty beaker with 50 mL ( V) of desired liquid sample.Take a clean empty beaker and weigh it on a weighing balance.Subtract V1 from V2 and note down the value as V.Note down the final volume of water to which it has been raised as final volume V2. The weight of the solid sample raises the water level to another mark. Immerse the solid sample in the beaker. ![]()
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