Can physical conditions such as high temperature and hydraulic shock be principal causes of explosions?

High temperature and hydraulic shock can indeed be principal causes of explosions, making the statement true. High temperatures can lead to the rapid expansion of gases or can cause materials to reach their ignition points, leading to combustion or explosion scenarios. For instance, in industrial settings, processes that generate excessive heat may compromise the integrity of materials or equipment, potentially resulting in explosive reactions.

Hydraulic shock, also known as water hammer, occurs when there is a sudden change in the flow of a liquid within a pipeline, which can generate significant pressure spikes. If the pressure exceeds the design limits of the system, it can cause ruptures or failures that could lead to explosions.

While specific cases and scenarios may dictate the likelihood of an explosion due to these factors, the broad possibility of physical conditions leading to explosive incidents makes the statement true irrespective of contextual variations.