centimeters
milometers
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There are some solids whose volumes can be calculated from the lengths of its edges and an appropriate formula. You could use a ruler in such cases. But there are many shapes for which you simply cannot do that.
You would need a balance to measure its mass. You would need a ruler to measure the length of its sides. Then you would need to calculate volume. Then divide the mass by the volume to get density.
A ruler to find the measures of the edges and a brain to multiply them together.
Measure the length, measure the width, measure the height, and multiply them all together. LxWxH = volume
get a tape measure or a ruler and measure it
To find the density you need the mass and volume and then, density = mass/volume. Given a ruler, you can easily measure an edge of the cube. If that is x units, then the volume is x3 cubic units. However, it is not clear how you find a mass with just a balance. You need some standard weights, but these do not appear to be provided. You are stuck and cannot answer the question.
Something to determine volume (like a bucket of water or a ruler), and a balance to determine mass. Divide the mass of the block by its volume to find the density of the block.
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.
Ruler
you have to know the mass and volume of the object. density equals the mass divided by the volume. if the mass of something was 5 and the volume 1 the density would be 5
You would need a balance to measure its mass. You would need a ruler to measure the length of its sides. Then you would need to calculate volume. Then divide the mass by the volume to get density.
When the object is a regular, geometric shape.
A ruler is used to measure length and does not account for the height or width of an object, which are necessary to calculate its volume. To find the volume of a paperclip, you need to measure its dimensions in three dimensions using a tool such as a caliper or by using a water displacement method.
A ruler - plus a pad & pencil to multiply with.
A ruler to find the measures of the edges and a brain to multiply them together.
you messure
Length times width times hight (you need a ruler)
Measure the length, measure the width, measure the height, and multiply them all together. LxWxH = volume