Question

Which one of the following statements is correct?
A.Only gases behave like fluids
B.Gases and solids behave like fluids
C.Gases and liquids behave like fluids
D.Only liquids are fluids

Answer 1

A fluid can be explained as a state of matter of matter which enables any given substance to flow in the direction that the substance is guided in. The most important word in this concept is ‘flow’. Anything that can flow is a fluid.

Complete step by step answer:
Before we move ahead to the solution of this question, let us first understand the nature of different states of matter.
Gases: gases are basically the form of a substance, in which the forces of attraction between the different molecules of the substance are very weak. This enables the molecules of the substance to be freely flowing, in any direction. Also, the volume of a gas is compressible in nature. Hence, the volume of gases is not fixed. This helps gases in flowing from one part of a fixed volume, to another, in any direction.
Liquid: liquids are very much similar to gases. Just like gases, the forces of attraction between the different molecules in a liquid are weak. But hey are more than that of gases, this gives liquids non – compressible volumes, i.e. fixed volumes. This helps the liquid to flow from one part of a fixed volume to another, in a fixed direction.
Solid: solids on the other hand have really strong forces off attraction between the molecules. This gives solids rigid geometries and fixed volumes. Hence, solids are unable to flow.
From the above discussed definitions, we can conclude that gases and liquids behave like fluids because of their ability to flow.

Hence, Option C is the correct option.

Note:
Amorphous solids have the tendency to flow but, slowly. It does not form a crystalline solid structure as particles in solids do not move but here it moves. Hence it is called a supercooled liquid. One of the most important examples of a supercooled solid is glass. If you observe properly, glass panes in windows become thick at bottom and bend the frame of the window. This is because, this supercooled solid flows in the direction of gravity and tends to thicken at the base.