When does static head occur in a fluid system?

Static head refers to the height of a fluid column that is under the influence of gravity when there is no fluid movement. In a fluid system, static head is significant in understanding hydrostatic pressure, which is the pressure exerted by a fluid at rest due to the force of gravity. When the fluid is not moving, the pressure at any point in the fluid can be determined by the height of the fluid column above that point, which is the essence of static head.

In contrast, the conditions described in the other options do not cultivate the concept of static head. Turbulent flow, for example, is characterized by chaotic fluid motion, which implies that the fluid is not at rest, thus negating static head. High temperatures and high pressures are related to the state and behavior of fluids, but they do not inherently influence whether static head exists. Static head is exclusively about the condition of fluids when they are stationary. Understanding this concept is crucial for applications involving pressure calculations and the design of plumbing systems.