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

Relative density

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 2 Comments

Relative density
The density of a substance is defined as mass per unit volume.
               Mass
Density=————-
              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
                            Density of substance
Relative Density=———————————
                            Density of water
                              Mass of substance                        Volume of water
Relative Density=——————————-    *     —————————-
                            Volume of substance                        Mass of water
If we take equal volumes of water and substance then
                                             
                                              Mass of substance
Relative density of substance=————————-
                                                 Mass of water
The relative density of a substance expresses the heaviness or density of the substance in comparison to water.
For Ex: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: Class 9, Gravitation 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

    Reply
  2. Ashmita poddar says

    July 29, 2020 at 4:53 pm

    Thankyou very much

    Reply

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