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Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class


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NCERT Question 21 The volume of 50 g of a substance is 20 cm3. If the density of water is 1 g cmโ€“3, will the substance float or sink? If Density of a substance > Density of the liquid, then it sinks in the given liquid. If Density of a substance < Density of the liquid, then it floats in the given liquid. Finding Density of substance Mass of the substance = 50 g Volume of the substance = 20 cm3 Density of substance = (๐‘€๐‘Ž๐‘ ๐‘  ๐‘œ๐‘“ ๐‘กโ„Ž๐‘’ ๐‘ฃ๐‘œ๐‘™๐‘ข๐‘š๐‘’)/(๐‘‰๐‘œ๐‘™๐‘ข๐‘š๐‘’ ๐‘œ๐‘“ ๐‘กโ„Ž๐‘’ ๐‘ ๐‘ข๐‘๐‘ ๐‘ก๐‘Ž๐‘›๐‘๐‘’) = 50/20 = 2.5 g/cm3 And Density of water = 1 g/cm3 Since, Density of substance > Density of water โˆด The substance will sink in water

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo