this is due to buoyancy which is directly proportional to mass.You can also state archimedes principle fro extra marks
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akashgang
HI HERE IS THE ANSWER WHEN THE DENSITY OF A SUBSTANCE IS LESS THAN WATER IT FLOWS ON THE SURFACE OF WATER . WHEN THE DENSITY OF A SUBSTANCE IS HIGH THAN WATER IT SINKS INTO WATER .
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this is due to buoyancy which is directly proportional to mass.You can also state archimedes principle fro extra marks
WHEN THE DENSITY OF A SUBSTANCE IS LESS THAN WATER IT FLOWS ON THE SURFACE OF WATER .
WHEN THE DENSITY OF A SUBSTANCE IS HIGH THAN WATER IT SINKS INTO WATER .