Fluid levels refer to the amount of liquid present in a specific container or environment. This measurement is crucial in various fields, such as engineering, medicine, and environmental science. For example, in a car's engine, maintaining the correct fluid levels of oil and coolant is essential for optimal performance and longevity. In medical contexts, monitoring fluid levels in the body can help assess a person's health. Conditions like dehydration or fluid overload can be identified by measuring blood or urine fluid levels. Accurate fluid level assessments are vital for effective treatment and management of various health issues.