another brick
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i would use kilograms
A brick weighs about 3.5 to 9lbs.
it equals a half a lb.
The weight of the displaced water is 2/3 the weight of the brick. So the weight of the brick is 3/2 the weight of an equal volume of water ... just another way of saying that the density of the brick is 1.5 gm/cm3.
That depends on the volume of the brick. Whatever its volume is, its weight underwater is(weight of the brick in air) minus (weight of an equal volume of water)