Final answer:
The density of a fluid can be experimentally determined by the water displacement method, which involves submerging an object of known mass in the fluid and dividing its mass by the displaced fluid's volume.
Step-by-step explanation:
To experimentally determine the density of a fluid, one can employ the water displacement method. This involves submerging an object of known mass into the fluid and measuring the volume of fluid displaced, which is equivalent to the volume of the object. After weighing the object to find its mass, you calculate the density by dividing the mass by the displaced fluid's volume. An example of this is using a graduated cylinder partially filled with water, submerging a piece of rebar, and observing the change in water level to determine the rebar's volume.
Using a simulation, such as the one indicated in the question, allows you to perform this experiment virtually. By adjusting the simulation to make the fluid density to 1.00 g/mL (equivalent to water), placing the green block (or any object designated by the simulation) in the fluid, you can measure its mass and volume. Division of the object's mass by the volume will give you the density of the object being investigated.