Final answer:
The brake hose diameter is usually specified as the internal diameter, which is essential for determining flow rate, velocity, and pressure in fluid dynamics.
Step-by-step explanation:
Brake hose diameter is usually specified as the internal diameter of the hose. This is the measure of the opening through which brake fluid is intended to flow, and it is the critical dimension for fluid flow dynamics. In various applications such as fire hoses and garden hoses, internal diameter plays a vital role in calculating parameters like flow rate, velocity, and pressure. For example, the internal diameter would be used to calculate the Reynolds number to assess the flow conditions—laminar or turbulent—within the hose. When related calculations are made, such as in the provided examples, you can observe the importance of internal diameter to determine several fluid dynamics phenomena.