How many times faster is body heat loss in water compared to air?

Body heat loss occurs at a significantly higher rate in water than in air due to the physical properties of both mediums. Water has a much greater thermal conductivity compared to air, which means it can absorb and carry away heat from the body more efficiently. In this context, studies indicate that the rate of heat loss in water can be roughly 25 times faster than in air.

This increased heat loss in water is critical for divers and those engaging in water-based activities, as it emphasizes the importance of proper thermal protection, such as wetsuits or drysuits when spending extended periods in cold water. The correct choice highlights the stark difference between thermal dynamics in water versus air, reiterating how quickly the body can lose heat in aquatic environments.