This depends upon the phase of the material whose density you wish to find. Fir an irregularly shaped solid, you would have to find the volume using a graduated cylinder (to measure how much liquid it displaces) and then weigh it on a scale (probably a triple beam balance). A regularly shaped solid would not require a graduated cylinder, you could just get its measurements with a ruler. A liquid could be measured using a graduated cylinder and a scale. A gas could have its density relative to that of the air measured by observing its buoyancy vs. weight measured in a balloon. That is a bit more complicated.
Hydrometer is used in batteries to measure density. A float tells you the density using displacement.
Measure the container itself, or measure the mass of the liquid and the container and find the density of that certain liquid has and isolate for the volume.
You can find a rock's density in many different ways. That object has a high density and will not float on water.
When you find the relative density of butter, use the formula for density = mass/volume. First find the mass, or weight of the butter, and then divide the butter by its volume.
You will need the mass and volume of the block. To find mass, use an electronic balance. To find volume, use length x breadth x height. For irregular solid, use the water displacement method. The density is mass divided by volume.
Hydrometer is used in batteries to measure density. A float tells you the density using displacement.
Density is a physical property of matter: it is not a tool.
Measure the container itself, or measure the mass of the liquid and the container and find the density of that certain liquid has and isolate for the volume.
What is a tool that scientists use to find patterns in their data
What tool you should use depends on what you want to achieve.
Mass = Density -------- volume
the tool used to find the width of a pencil is a ruler. But use the centimeter side of it for the width only!!
Hydrometer
divison
Use a mass balance to find the mass then find the volume by V=mass/density.
Find the mass of a known volume of the liquid and use the formula mass/volume to find the density.
divison