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You are here: Home / Class 9 / Gravitation / Relative Density

Relative Density

Last Updated on February 16, 2022 By Mrs Shilpi Nagpal 3 Comments

Relative Density

The density of a substance is defined as mass per unit volume.

Relative Density $=\frac{\text { Mass }}{\text { Volume }}$

S.I. unit of density is kg/m3

The relative density of a substance is the ratio of its density to that of water

Relative Density $=\frac{\text { Density of substance }}{\text { Density of water at 4ºC }}$

Relative density of a substance $=\frac{\text { Mass of the substance }}{\text { Volume of the substance }} \times \frac{\text { Volume of water }}{\text { Mass of water }}$

If we take equal volumes of water and substance then

Relative Density of substance $=\frac{\text { Mass of substance }}{\text { Mass of water }}$

The relative density of a substance expresses the heaviness or density of the substance in comparison to water.

For Example : Relative density of iron is 7.8 means iron is 7.8 times heavy as an equal volume of water.

Relative density has no units. Density of a substance is one of its characteristic property and is different for different substances.

Filed Under: Gravitation, Class 9 Tagged With: density, relative density

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

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  1. Mahesh Kumar says

    February 28, 2019 at 6:45 pm

    Thank u for this work

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  2. Ashmita poddar says

    July 29, 2020 at 4:53 pm

    Thankyou very much

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  3. Meghana says

    November 9, 2021 at 1:57 pm

    thanks a lot .

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