You can still use volume displacement to find the volume of a rock that floats in water. You will just have to use a sinker of a known volume to submerge the rock. The procedure would look like this:
1. Fill a graduated container partly with water. Note the volume.
2. Add the sinker and note the change in water level. The water displaced by the sinker will be equal in volume to the sinker....
You can still use volume displacement to find the volume of a rock that floats in water. You will just have to use a sinker of a known volume to submerge the rock. The procedure would look like this:
1. Fill a graduated container partly with water. Note the volume.
2. Add the sinker and note the change in water level. The water displaced by the sinker will be equal in volume to the sinker. So if you added the sinker and the water rose by 5ml, the volume of the sinker is 5 ml.
3. Attach the sinker to the rock and submerge both in the water. Note the volume of water displaced by both objects together.
4. Subtract the volume of the sinker found in #2 from the volume found in #3 to find the volume of the rock alone.
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