Final answer:
Turbulence in the flow can cause the fractional rate of flow at high values to differ from its constant value during an experiment.
Step-by-step explanation:
In certain situations, the fractional rate of flow at high values can differ from its constant value during an experiment due to turbulence in the flow.
Turbulence is a type of chaotic and unpredictable flow pattern that occurs when there are obstructions or roughness in the flow. It can cause fluctuations in the flow rate, leading to variations from the expected constant value.