The liquid with the largest density is Liquid Z.
The phrase "identical cubes of equal mass floating" means that there are multiple cubes that are exactly the same size and weight, and they are floating in a liquid or gas.
The term "identical" means that the cubes are exactly the same in every way, including size, shape, and weight. The term "equal mass" means that each cube has the same weight or mass.
The term "floating" means that the cubes are suspended in a liquid or gas without sinking or falling to the bottom. This phrase may be used in various contexts, such as in physics experiments or in descriptions of objects in a fluid medium.
From the diagram, we can see that the volume of object M in liquid Z is the smallest.
This means that liquid Z has the largest density, since density is defined as mass per unit volume.
Here is a table summarizing the information in the diagram:
Liquid Volume of object M Density
X Medium Medium
Y Large Small
Z Smallest Largest
Therefore, the answer is Liquid Z.