OSHA 10-Hour Construction ReviewHealth Hazards in ConstructionHard
A construction worker is performing tasks while wearing multiple layers of clothing in cold weather. Which of the following is the most significant physiological risk if these layers become wet from sweat?
- ARapid conductive heat loss, increasing risk of hypothermia.
- BEnhanced insulation, leading to overheating.
- CDevelopment of acute skin irritation and rashes.
- DIncreased risk of heat exhaustion.
Show answer & explanationAnswer & explanation
Correct answer: A. Rapid conductive heat loss, increasing risk of hypothermia.
Wet clothing, especially in cold weather, drastically reduces its insulating properties. Water conducts heat away from the body much faster than air, leading to rapid conductive heat loss and significantly increasing the risk of hypothermia, even at temperatures above freezing.
Why the other options are wrong
- B. Wet clothing loses its insulating properties, leading to heat loss, not enhanced insulation or overheating in cold conditions.
- C. While skin irritation can occur, the most significant physiological risk in cold, wet conditions is severe systemic heat loss.
- D. Heat exhaustion is a risk in hot conditions, not typically from wet clothing in cold weather leading to rapid heat loss.
Wet Clothing in Cold
Wet clothing, particularly cotton, loses its insulating value in cold environments. Water conducts heat away from the body rapidly, dramatically increasing the risk of hypothermia.
- Water conducts heat 25 times faster than dry air.
- Hypothermia is a dangerous drop in body temperature.
- Layering with moisture-wicking fabrics is crucial.
Memory trick: Wet in Cold: Water Wicks Warmth, Watch for Hypothermia's Hold.