👉 The term "fluid" in this context refers to a substance or state that can flow, change shape, or move easily without resistance. It describes materials like liquids and gases, which can take the form of their container's shape and move from one place to another. Unlike solids, which maintain a fixed shape and volume, fluids adapt their form to fill any space they occupy. This fluidity is due to the weak intermolecular forces between particles, allowing them to slide past each other and move freely.