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PHYSICS CH3 Fluids — Science STD 9 — Question

Tamilnadu BoardEnglish MediumSTD 9SciencePHYSICS CH3 Fluids4 Marks
Question
Describe the construction and working of the Pycnometer.
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Answer

Pycnometer (Density Bottle)Purpose: To measure relative density.Construction :
  1. Pycnometer consists of a ground glass stopper with a fine hole through it.
  2. When the bottle is filled and the stopper is inserted, the excess liquid rises through the hole and runs down outside the bottle.
Working:
  1. The bottle will always contain the same volume of liquid at a constant temperature.
  2. The density of the given volume of substance to the density of equal volume of referred substance is called relative density or specific gravity of the substance.

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