Grams
As it is a marble slab, it could be supposed that the shape is fairly regular. So multiplying length by width will give the square area of the slab. It could be that the square area is not required, and the length and width is needed simply to fit the marble slab into a recess or is to be used as a work-surface , etc. But, either way, a steel tape measure is usually required to measure the marble slab.
If I was you i would use millimetres or centimetres.
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.
I would use a micrometer. A caliper would do as well.
Grams
You can measure the speed of a marble by using a stopwatch to record the time it takes for the marble to travel a known distance. Divide the distance by the time to calculate the speed in units such as meters per second or feet per second. Alternatively, you can use a motion sensor or tracking software to measure the speed of the marble in real time.
cut your ruler as small as u can
As it is a marble slab, it could be supposed that the shape is fairly regular. So multiplying length by width will give the square area of the slab. It could be that the square area is not required, and the length and width is needed simply to fit the marble slab into a recess or is to be used as a work-surface , etc. But, either way, a steel tape measure is usually required to measure the marble slab.
millimetres or mm
milimetersMilliliter
If I was you i would use millimetres or centimetres.
That depends what aspect of a marble you want to measure, for example its diameter, its mass, its density, its color, etc.
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.
To find the volume of a steel marble, you can use the formula for the volume of a sphere, which is V = (4/3)πr^3, where r is the radius of the marble. Measure the diameter of the marble using a caliper, then divide it by 2 to get the radius. Plug the radius into the formula and calculate the volume using the value of π. This will give you the volume of the steel marble in cubic units.
A marble would sink in shampoo because the density of the marble is greater than the density of the shampoo. Density is a measure of how much mass is contained in a given volume, and objects with higher density will sink in substances with lower density.
I would use a micrometer. A caliper would do as well.