Final answer:
A swimming pool is any structure intended for swimming or recreational bathing with sufficient depth, usually over 30 centimeters, where water and chemical balance are maintained for health and safety.
Step-by-step explanation:
A swimming pool is defined as any structure intended for swimming or recreational bathing that contains water over a certain depth. The exact depth that delineates a swimming area meant for submersion from, say, a shallow children's play pool, varies by region and governing body, but for meaningful interaction with water within a swimming pool, depth is typically greater than 30 centimeters (about 1 foot deep).
This threshold is significant as even small amounts of water can pose drowning risks. Proper maintenance of swimming pools is crucial for health and safety. This includes regulating the chemical balance of the water to prevent eye irritation and structural damage. The water in a pool is a complex mixture, and for example, the relative amount of calcium ion (Ca2+) should be controlled to maintain the facilities and the health of the people using the pool.