Concept:Relative density is the ratio of the mass of a substance to the mass of an equal volume of water:
Relative density=mass of equal volume of watermass of substance.Explanation:A density bottle has a fixed known volume, making it ideal for powders.
First, weigh the empty density bottle using the beam balance.
Then fill the bottle with the powdered substance and weigh it again to find the mass of the powder.
Next, fill the same bottle with water and weigh it to obtain the mass of an equal volume of water.
Divide the mass of the powder by the mass of the water to get the relative density.
A eureka can is used for measuring the volume of irregular solids by water displacement, not for powders.
A pipette and a burette are used for measuring liquid volumes, so they are unsuitable here.
Answer:A. a density bottle