SDI Open Water Scuba Diver Practice Exam 2026 – Complete Test Prep

Question: 1 / 400

How much faster does water conduct heat away from your body compared to air?

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Water conducts heat away from your body approximately 25 times faster than air. This significant difference is crucial for divers to understand because it highlights the importance of having appropriate thermal protection when submerged. The higher thermal conductivity of water means that divers can lose body heat much more rapidly when they are in cold water compared to how they would in the air.

Being aware of this factor helps divers make informed decisions about the gear they need to wear, such as wetsuits or drysuits, to minimize heat loss and prevent hypothermia during dives. The correct answer reflects the widely accepted understanding of thermal conductivity in different media, reinforcing the necessity for divers to prepare adequately for varying water temperatures.

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