| Biology demonstration manual |
Lesson: L'appareil excrÃ©teur
Rationale: Demonstrate the cooling effect of the evaporation of sweat.
cloth or cotton
1. Soak a piece of cloth in alcohol.
2. Swab the back of the student's hand.
3. Ask the students to report the effect of the evaporation.
Source: Silver Burdett Biology, p. 590.