What is Relative Density? This value is measured in g/cm³ [kg/m³]. Density of a substance is one of its characteristic property and is different for different substances. Relative density (R.D) of a substance can be calculated by dividing density of a substance with the density of water. Principle: Specific gravity usually means relative density with respect to water. (4.80), we obtain the expression for relative density as – Equation (4.75) is commonly used to determine the relative density of soil in the laboratory. = density of substance/density of water, note that relative density has no unit, the relative density of mercury is 13.6 but its density 13.6 x 10 3 kgm-3. Generally, the density of water at 4 °C (the temperature at which the density of water reaches its maximum value) is used as the reference to measure relative density. The density of pure water is altered by temperature. B) 720 kgm-3. The term "relative density" is often preferred in scientific usage. Relative density has no units. D) 72000 kgm-3 Water density is often used for calculating relative density [Wikimedia] Density is a physical value equal to the ratio of the mass of a substance to its volume. At approximately what other temperature T does water have the same density as at 1 ∘C ? Relevant Equations:: Just looking at graphical and analyzing. For Ex:Relative density of iron is 7.8 means iron is 7.8 times heavy as an equal volume of water. ∴ Relative density of water r = ρ w ρ w = 1 Water density increases as the temperature gets colder. The relative density of a substance expresses the heaviness or density of the substance in comparison to water. Oven Dried Specific Gravity. For example, Thus, Relative density of iron is 8.5 (No unit is applied). Note that the density of pure water is defined to be 1 gram per cubic centimeter (or, g/ml). Relative density of substance is defined as the ratio of density of substance to the density of water. A consequence is that ice floats on water. It is the ratio of the oven dried density of the aggregate to the density of the gas free distilled water at a standard temperature … The difference between the specific gravity and density is that at room temperature and pressure is 1gram per 1 cubic cm is the density of water this density is treated as a standard and the density of any other material (usual liquids) is calculated relative to this is called relative density or specific gravity. Homework Statement:: The relative density of water is determined by the rate at which it expands (and contracts) with changes in temperature. Also, pure water is less dense than seawater, so fresh water can float on top of salt water… [Density of water = 1000kg m-3] Options. Determination of Relative Density: Relative density of a natural cohesionless or compacted soil can be determined in the laboratory by using the standard relative density equipment. The relative density is a dimensionless quantity and is expressed as oven dried, saturated surface dry and apparent. But i cant seem to figure out why the answer is 8 degree celsius. = mass (or weight) of a substance/mass (or weight) of equal volume of water, it is also defined as R.d. Question What is the density of a fuel of relative density 0.72? The relative density of a substance is a pure number without any unit. Relative density, or specific gravity,[1][2] is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. In SI units, the density of water is approximately 1000 kg/m 3 and in CGS units it’s 1 g/cm 3 which makes relative density calculations pretty convenient . Although the density of water is pretty close to 1 g/mL, certain disciplines of science need to know the density of water with a higher specificity. C) 7200 kgm-3. It tells how many times a substance is heavier than water. Relative density is defined as: R.d. 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