Question

why does the skin of your fingers shrink when you wash your hand for a long time

Answer 1

Our skin of finger shrinks whenwe do the same, as when we wash the clothes the water around the fingers or hand behaves like hypertonic solution and water starts coming out from finger(cell) toout side region causing the fingers to shrink.

Answer 2

Answer:

Our skin is porous and behaves as a semi permiable membrane. When we wash clothes, our hands are exposed to water for a long time. Our hands behave as hypertonic solution and the outside of our hands behave as hypotonic solution. ... The water is not entering your hands, it actually leaves them and hence, they shrink.