fruits and vegetables contain water so they conduct electricity. Sugar Solution also contains water but it does not conducts electricity.Why?
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it's a question of chemical effects of electric currents.
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why does ships not sink in water even when it's made of metal and it's heavy too?
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If you take that aluminum and spread it into foil, and make a boat shape out of that, it will float on water because now the mass of the aluminum metal has stayed the same, but the volume is much greater. So, the density (density - mass / volume) is much less. A boat has a rigid hull, so its volume doesn't increase.
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