prepare various solutions with different densities by adding some drops of ink different amounts of water and explain the principle involved n it to your friends
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when you add more quantity of in water then you get high density of solution of ink and when you add a few drops of ink in water then you get low density of solution of ink.
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If increasing number of ink drops are added to same amount of water in separate vessels, the density of ink will increase respectively as the value of (part of ink/ part of water) increases [part of water will be same in all the solutions] .
Now if the opposite happens, same no. of ink drops are added to increasing amount of water separately; the density of ink will decrease as the value of (part of ink/ part of water) decrease [part of ink will be same in all the solutions].
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