High Heat Loss Areas
Your body has five major heat loss areas:
- Head (responsible for 50% of heat loss)
- Sides of chest
- External Sources: The sun, fires, and other heat sources warm your body.
- Digestion: Heat is produced as your body digest food.
- Muscular activity: As you move, your body produces heat, but activity in cold water may cause you to loose more heat than you gain because cold water is constantly flowing past your body's high heat loss areas.
- Radiation: Radiation occurs when heat is emitted from your body. Clothing is the obvious answer to preventing heat loss through radiation.
- Respiration: You lose heat by exhaling air that your body has warmed. Some of this heat loss can be prevented by covering your mouth with a loose knit scarf, hat, or other fabric.
- Evaporation: When your swaet evaporates, your body looses heat and moisture into the air. This explains why wet clothes make you cooler, which can be a good thing in a hot climate but deadly in a cool one.
- Conduction: Being in direct contact with cold surfaces - either solids or liquids - takes your heat away. Insulating yourself from these cold surfaces will stop or greatly slow conductive heat loss.
- Convection: Why does it feel cooler on wind days? Convection! This happens when your body's heat is taken away by moving air or water.