Question

Find the relative density of a substance whose density is 986kg/m3

Answer 1

Provided that:

• Density of substance = 986 kg/m³

To calculate:

• Relative density of substance

Solution:

• Relative density of substance = 0.986

Using concept:

• Relative density formula

Using formula:

• ${\small{\underline{\boxed{\pmb{\sf{R.D \: = \dfrac{Substance \: density}{Water \: density}}}}}}}$

Knowledge required:

• SI unit of density = kg/m³

• There is no unit for relative density.

• Density of water in SI = 1000 kg/m³

Required solution:

→ Relative density = Density of substance / Density of water

→ Relative density = 986 / 1000

→ Relative density = 0.986

→ Relative density of the substance = 0.986

Additional information:

$\begin{gathered}\boxed{\begin{array}{c}\\ {\pmb{\sf{Some \: formulas!}}} \\ \\ \sf \star \: Density \: = \dfrac{Mass}{Volume} \\ \\ \sf \star \: Volume \: = \dfrac{Mass}{Density} \\ \\ \sf \star \: Density \times Volume = Mass \end{array}}\end{gathered}$

• Density: Density is defined as the mass of a unit volume of the given substance. It's SI unit is kilogram per metre cube.

• CGS unit of density = g/cm³

• SI unit of volume = m³

• CGS unit of volume = cm³

• Density of water in CGS = 1 g/cm³