K N Chattopadhyay 2008 Phys. Educ. 43 203 doi:10.1088/0031-9120/43/2/011
Finding the density of a liquid using a metre rule
K N Chattopadhyay
Show affiliationsA simple method, which is based on the principle of moment of forces only, is described for the determination of the density of liquids without measuring the mass and volume. At first, an empty test tube and a solid substance, which are hung on each side of a metre rule, are balanced and the moment arm of the test tube is measured. Keeping the solid substance in the same position, the test tube is filled with a liquid of known density up to a mark and then balanced. The moment arm is measured. Then the test tube is filled with the unknown liquid (whose density is to be determined) up to that mark and after balancing the moment arm is measured. By measuring these three moment arms and using the density of the known liquid, the density of the unknown liquid is determined.
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Issue 2 (March 2008)
Received 10 September 2007
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Finding the density of a liquid using a metre rule
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