Question

A piece of wax floats on brine. What fractions of it’s volume is immersed?
Density of wax = 0.95 g cm-3,
Density of brine = 1.1 g cm-3

  • Category: Upthrust in Fluids Archimedes' Principle and Floatation Class 9 ICSE
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Answer

Density of wax = 0.95 g cm-3

Density of brine = 1.1 g cm-3

By the principle of floatation,

{Volume\ of\ immersed\ part\over Total\ volume} = {Density\ of\ wax\over Density\ of\ brine}

∴ {Volume\ of\ immersed\ part\over Total\ volume} = {0.95\over 1.1} = 0.86

Hence, the piece of wax floats with 0.86th part of it’s volume immersed in brine surface.

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