Why it works
How sweating cools the body
Short answer
Sweat cools when it evaporates from skin; sweat that drips away without evaporating provides less cooling.
The simple explanation
- ✓Moving air can increase evaporation.
- ✓High humidity reduces it.
- ✓Sweating also loses water and salts, so hydration matters.
Why it works
This advice follows NHS guidance and the underlying principles of sweating and evaporation.
Important exceptions
Safety, health, weather and the design of your home can change what is appropriate. Stop if an action makes conditions worse.
Related guides
Sources & evidence
Reviewed 2026-08-21
- NHS: Dehydration ↗
Supports: Dehydration risks, signs, fluids and when to get help.
health guidance · Accessed 2026-08-21