Sweat cools the body byMultiple Choiceconvection.conduction.evaporation.radiation.hydration.

Break Down the Problem

1. Identify the cooling mechanisms mentioned in the options: convection, conduction, evaporation, radiation, and hydration.
2. Understand how sweat functions in regulating body temperature.

Relevant Concepts

1. Convection: Heat transfer through fluid motion.
2. Conduction: Heat transfer through direct contact.
3. Evaporation: Cooling effect that occurs when liquid turns into vapor.
4. Radiation: Heat transfer through electromagnetic waves.
5. Hydration: Maintaining fluid balance in the body but not a cooling method.

Analysis and Detail

• Sweat is primarily composed of water. When sweat evaporates from the skin's surface, it absorbs heat from the body, causing a cooling effect. This process is particularly effective because it utilizes the latent heat of vaporization, which is the amount of energy required to convert water from a liquid to a gaseous state.
• Convection would involve moving air or liquid carrying heat away, but it does not directly involve sweat.
• Conduction would imply direct contact which does not apply to how sweat cools the body.
• Radiation involves heat loss through infrared waves, but this isn't the primary mechanism when we sweat.
• Hydration is important for overall body function but does not directly cause cooling.

Verify and Summarize

Given the explanation, the most accurate answer is evaporation, as it describes the process where the heat absorbed from the body is used to convert sweat into vapor, thus cooling the body.

Final Answer

Sweat cools the body by evaporation.