Mass
You take a graduated cylinder,or anything you can measure water in, and put water in it. You drop the marble in and the change in water height is your volume. For example if the cylinder is filled up to 10ml and after you drop in the marble it goes to 15ml then the marble has a volume of 5ml cubed.
the rock has a greater volume than the marble
Water displacement.
What do you want to measure about the marble? Its diameter, radius, circumference, volume, mass, density...?
The density of the marble is about 4.94 g/cm3
All of the above? You can say the same thing in many ways. All of the following are different ways of saying the same thing, and all are correct: The marble sinks because the marble weighs more that an equivalent volume of water. The marble sinks because its density is greater than the density of water. The marble sinks because it has a greater mass than than same volume of water (and there is gravity/acceleration).
drop the marble in water and then see how much the water went up
About the size of a marble!
There are several methods:From geometry and the formula for the volume of a sphere:Assuming the marble is a perfect sphere, the radius of the marble is one-half of the diameter, or width of the marble. Use the formula for volume,V = (4/3) pi r3where pi is approximately 3.1416 and can usually be found on a scientific calculator. R is the radius as mentioned before. The formula in text is "four-thirds times pi times the radius cubed." Make sure to do the cubing first.From the displacement the marble causes in water or other liquidyou can measure the volume of a marble by filling up a glass beaker to whatever amount you'd like,then you would see how much the water went up.and that would be you answerFrom the density of the marbleWeigh the marble and determine typical density of glass from available tables. As the density of the marble is found by the formulaDensity=mass/volume,divide the mass in grams by the density in gm/cm3 to determine the volume in cm3.
Thats an inference
Approx 1 millilitre.