What is a key characteristic of hydraulic fluid under low pressure conditions?

In low-pressure conditions, hydraulic fluid can indeed contain dissolved air, which can lead to cavitation. Cavitation occurs when the pressure in the fluid drops, leading to the formation of vapor bubbles. When these bubbles travel to areas of higher pressure, they collapse, potentially causing damage to components like pump impellers or valves. This phenomenon highlights the importance of managing the dissolved gases within the hydraulic fluid, particularly in systems where low pressure may exist.

The other statements do not accurately describe the behavior of hydraulic fluid under low pressure. For instance, while temperature can affect the viscosity of hydraulic fluid, it may not remain consistent as indicated. Additionally, hydraulic fluid can still flow and behave as a liquid even under low pressure, rather than behaving like a solid. Moreover, whether or not a hydraulic fluid requires replenishment is contingent on system design and usage rather than solely pressure conditions.