The difference between liquid density and relative density

The difference between liquid density and relative density

The differences between ‌liquid density‌ and ‌relative density‌ can be summarized as follows:

‌I. Definitional Differences‌

‌Density‌
Represents the mass per unit volume of a substance (formula: Density = Mass/Volume), expressed in units such as ‌kg/m³‌ or ‌g/cm³‌. For example, the density of water at 4°C is ‌1 g/cm³‌.

‌Relative Density‌
Refers to the ratio of a substance's density to that of a reference substance (usually water or air), and is a dimensionless quantity. For instance, if a liquid has a relative density of ‌0.8‌, it means its density is ‌80%‌ that of water.

‌II. Core Distinctions

The physical significance of ‌density‌ is an ‌absolute mass indicator‌, with units such as ‌kg/m³‌, and it can be directly measured as mass per unit volume‌.

The physical significance of ‌relative density‌ is a ‌comparative indicator‌, which is ‌unitless‌ and represents a density ratio (e.g., liquid density/water density)‌

‌III. Application Scenarios‌

‌Density‌
Used in practical calculations such as material usage and buoyancy. For example, the density of steel in engineering is ‌7.85 g/cm³‌.

‌Relative Density‌
Commonly used to quickly compare material properties, such as in the petroleum industry where relative density helps assess crude oil quality.

‌IV. Conversion Relationship‌

Both can be converted using the formula:
‌Relative Density = Substance Density / Reference Substance Density‌ (with water density at 4°C typically serving as the standard).

SH102D Automatic Density Tester adopts the principle of U-type tube oscillation method, effectively combines Partier accurate temperature control technology

This method measures the liquid density according to the principle of different oscillation frequency when double U tubes are filled with different media, complying with GB / T2013-2010 and GB / T29617-2013 and ASTMD 4052. U-shaped vibrating tube densitometer adopts the international standard ISO 12185 1996 "Densitometry of Crude oil and petroleum Products- -U-shaped vibrating tube method" also meets the requirements of SH / T0604-2000 "Liquid density and Relative density method (digital densitometer)" standard