Chapter 9

NCERT
Class 9
Science
Solutions
21. The volume of 50 g of a substance is 20 cm3. If the density of the water is 1 g cm–3 will the substance float or sink ?

Question:

The volume of 50 g of a substance is 20 cm3. If the density of the water is 1 g cm–3 will the substance float or sink ?

Answer:

According to question–

Mass of the substance m = 50 g

Volume of the substance v = 20 cm3

density of water = 1 g cm–3

density of the substance = mass / volume

density of the substance = 50/20

density of the substance = 2.5 g cm–3

The density of the substance is 2.5 g cm–3 and it is greater than the density of water so. The substance will sink.

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