What is hydriatics the study of?

Hydriatics specifically focuses on the study of mineral water's physiological and therapeutic properties on the body. This field examines how various minerals found in water can influence health, promote healing, and support bodily functions. The therapeutic use of mineral water has been recognized for its potential benefits in various health conditions, making this option the most accurate representation of hydriatics.

The other choices, while touching on aspects related to water and health, do not encapsulate the full scope of hydriatics. For instance, while the impact of heat on the body relates more closely to thermotherapy than to hydriatics, and the effects of pure water on hydration emphasize a different aspect of bodily functions, neither captures the unique focus on mineral water’s properties. Essential oils and their preparations are entirely distinct from the study of water, as they pertain to aromatherapy and not to the therapeutic use of hydrotherapy. Thus, the emphasis on mineral water’s effects makes the correct choice clear.