Why a hydrometer rises slightly in water, when detergent is added?

Question

its a density realted question i guess.......i need some help with ths one......if someone cn help.....plzzz

Answer 1

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Answer 2

The detergent acts as a surfactant (decreases the surface tension of the water).

In layman's terms, it makes the water like all slippery, so it's more likely to push out any object which floats.