In severe heat a person loses water each hour?

In severe heat, a person can lose a significant amount of water through perspiration and respiration, potentially exceeding a liter per hour depending on factors like activity level, humidity, and individual physiology. This loss can lead to dehydration, which can impair physical and cognitive functions. To maintain hydration, it's crucial to drink fluids regularly and replenish electrolytes if necessary. Staying cool and avoiding excessive exertion during peak heat is also important for overall health.