👉 A fluid, in this context, is a substance that flows easily and smoothly without much resistance. Think of honey or oil—both are fluids that move and spread readily when disturbed, unlike solids which resist flow. This property is due to the particles within fluids being loosely packed and able to slide past one another, allowing them to change shape or move in response to external forces. This fluidity is essential for many natural processes and human activities, from the circulation of blood in our bodies to the operation of hydraulic systems.
