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Fill the cylinder with water to a marked point. Then place the rock in the water and measure how much the water level rises. That will give you the amount of volume displaced by the rock and so the volume of the rock.
Because most rocks are not made up of common geometric shapes, it would be difficult or impossible to find the volume of a rock using a ruler; there would be no easy way to measure the rock's irregular volume. However, by measuring the volume of liquid a rock displaces, its volume can easily be determined.
Fill a beaker or measuring cylinder with water and record the volume of water indicated. Put the rock in the beaker/measuring cylinder and record the new volume of water indicated. The difference between the two volumes is the volume of the rock.
put some water in a measuring cylinder, take the reading and then place the pebble in the water and take over the reading.Then you minus the two values to get the volume of the pebble\rock
use a graduated cylinder or other volume measuring container. just put a certain amount of water in, take note of it, then put the rock in and measure the difference, make sure the water goes up and above the rock though
If the rock is small enough to be put into the cylinder, then fill the cylinder first with water to a known level (the graduations will usually indicate the volume). Then slowly drop the rock into the cylinder without splashing. Now read the level of the water (again the graduations will usually indicate the volume). Subtract the first reading from the second and that would be the volume of the rock.
You can find the volume of a small rock in no time at all. Just fill up a container that is marked by volume with water and record the volume. Then drop the small rock inside the container. Record the new volume. Find the difference between the new and old volumes. This is the volume of the small rock. You could do this in any liquid.
water
To measure the volume of a regular shaped rock, simply fill up a container with volume markings to a desired quantity of water. Record this quantity. Then place the rock in the water. Record the new volume. Find the difference between the new volume and the old volume and you will have the volume of your regular shaped rock.
The simplest way is to use the formula: P = m / V Density = mass / volume So to calculate the denisty of the rock you will have to find out how much it weighs and how much volume it occupies. You can measure the weight by placing the rock on a weighing scale, this will give the weight in grams. You can determine the volume by submerging the rock in a measuring cup partially filled with water and measuring how much the volume increases. This will give the volume in cm3 Now use the formula to calculate its density in g/cm3.
Fill the cylinder about half way with water and measure the amount. Then drop the rock in and measure the amount of water. Now subtract no rock from rock in and that will give you the amount of volume displaced from the rock.
Use a beaker, obviously. A beaker is wider than a graduated cylinder.