Density of an object class 9 | matric part 1 physics density of objects | 9th class physics ch 7

Density of an object class 9 | matric part 1 physics density of objects | 9th class physics ch 7

DENSITY OF AN OBJECT
Archimedes principle is also helpful to determine
the density of an object. The ratio in the weights of a body
with an equal volume of liquid is the same as in their
densities.
Let Density of the object = D
Density of the liquid = 
Weight of the object = w1
Weight of equal volume of liquid = w = w - w 1 2
Here w
is the weight of the solid in liquid.
2
According to Archimedes principle, w
is less than its 2
actual weight w
by an amount w. 1
Since
or
Thus, finding the weight of the solid in air w and 1
its weight in water w ,
we can calculate the density of the
2
solid by using equation 7.7 as illustrated in the

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