👉 The passive fluid refers to a state of matter that exhibits properties of both liquids and gases, characterized by its ability to flow and take the shape of its container while also having a higher density than gases but less so than liquids. This unique combination results in the passive fluid having a viscosity that is intermediate between liquids and gases, allowing it to move easily yet retain some cohesive properties. Examples of passive fluids include water and air, which can flow like liquids but also exhibit some gas-like behavior in terms of compressibility and spreading out when disturbed.
