Step 1: Understand what fluids are. Fluids include liquids and gases that can flow.
Step 2: Learn about the property of incompressibility. This means that fluids do not change their volume significantly when pressure is applied.
Step 3: Recognize that in many practical situations, especially in hydrodynamics (the study of fluids in motion), fluids are treated as incompressible.
Step 4: Conclude that the property of being incompressible is a common assumption made about fluids.
