👉 The probability that fluid exists in a given system is determined by the balance between the forces driving its movement and those resisting it. Fluids, whether liquids or gases, flow when there is a pressure gradient or an external force applied, such as gravity or friction. The likelihood of fluid being present depends on factors like temperature, pressure, and the system's geometry. For instance, in a closed container under low pressure, a fluid might not exist as a distinct phase but could still be present as dissolved gases or dissolved solids. However, in an open system with sufficient pressure and temperature to overcome the fluid's cohesive forces, a clear fluid is more likely to exist. The concept of fluidity itself hinges on the balance between these opposing forces, making the chances of fluid presence highly context-dependent.
