The student found the volume of the copper block by multiplying the area of its base by its height - Edexcel - GCSE Physics - Question 2 - 2016 - Paper 1

To measure the volume of the small stone, the student can use the water displacement method. Here is a step-by-step process:

1. Prepare a Graduated Cylinder: Fill a graduated cylinder with a known volume of water, ensuring the stone will be submerged when added.

2. Record Initial Water Level: Take note of the initial water level in the cylinder.

3. Submerge the Stone: Carefully place the small stone into the water. Ensure it is fully submerged without touching the sides of the cylinder to avoid any erroneous readings.

4. Observe Water Level Rise: Observe the new water level in the graduated cylinder. The difference between the initial level and the new level is the volume of the stone.

5. Calculate Volume: Finally, calculate the volume of the stone by subtracting the initial water level from the final water level: $ext{Volume of the stone} = ext{Final water level} - ext{Initial water level}$

This method works effectively because it takes advantage of the principle that an object submerged in fluid displaces a volume of fluid equal to its own volume.