The volume of the key is 0.8 mL.
Volume of objects using sinker method
An object that floats on water will displace its own volume. In the same vein, an object that sinks in water will displace its own volume.
Thus, in order to find the volume of an object that sinks in water, measure the volume of water that it displaces.
In this case, the water displaced by the key was measured 3 times. The average of the 3 readings will give the volume of the key.
Volume of the key = 0.7 + 0.8 + 0.9/3 = 0.8 mL
More on volume of objects can be found here: https://brainly.com/question/11685836
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