r reflecting writing on lactometer and hydrometer
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Explanation:
Lactometer :
It is specially designed hydrometer which is used for measuring the relative density of Milk. and hence for testing the purity of milk.
If the milk is skimmed, its density is higher , so a lactometer cannot detect the purity of milk if the milk is skimmed.
It is based on the principle of Floatation.
Hydrometer :
Hydrometer is a device used for the measurement of relative density of a liquid. It is based on the principle of Floatation.
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