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Difference between Density and Relative Density

Difference between Density and Relative Density:


  • Density is the mass of a substance divided by its volume (RATIO OF MASS PER UNIT VOLUME). This can be calculated as g/cm3.
  • Density defines the quantity of matter contained in a given space or volume at a given temperature and pressure. Density is the amount of material that is present in a unit volume. A density is a measurement of the concentration of a substance in a given volume.
  • The most common units for density are g/cm3 and g/L.
  • Density is a property of an object that determines how tightly packed the particles are. 

Relative Density:

  • Relative density is the ratio of the weight of a sample to its volume. It is measured in grams per milliliter (g/mL). Simply (Relative density is a ratio of the mass to volume of a substance compared to that of water). Relative density is used to determine the amount of materials in a sample. It uses the mass per unit volume and the mass per unit area. The relative density is calculated by dividing the mass per unit volume by the density of the material.
  • Relative densities are expressed in decibels (dB) per meter, which is referred to as "relative intensity".
  • Relative density does not depend on temperature and pressure. the relative density of a certain substance at a given temperature and pressure, It will be constant for that temperature and pressure.  
  • Relative Density doesn't mean absolute density, The expression of relative density only represents ratios between different substances or materials, and can't be compared with absolute measures such as weight or volume.
  • Relative density also depends on certain factors like pH value, amount of salt present in water, etc.,
  • Relative density also applies to various types of materials including solids, liquids, and gases. It's helpful in quantifying the relative proportion of different substances within each type of substance.

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