In severe heat, how much water can a person lose each hour?

In conditions of severe heat, it is possible for a person to lose approximately 1 quart of water each hour through sweating and other mechanisms of heat regulation. This significant loss underscores the importance of maintaining proper hydration, especially during physical exertion or in high-temperature environments.

Losing this amount of fluid can quickly lead to dehydration if it is not replenished adequately. Understanding this fact is crucial for anyone working or exercising in hot conditions, as it emphasizes the need for frequent hydration to prevent heat-related illnesses. The other options reflect smaller quantities that do not accurately represent the average water loss in severe heat, making them less relevant in this context.