1. PJAS Presentation Format

2. The Effect of Light Power On The Evaporation Rate of Coffee

3. Purpose To measure the effect of additional energy from a light source on evaporation of coffee

4. Hypothesis: If a bulb of greater power is used to warm coffee, then more of the coffee will evaporate.

5. Evaporation Energy Evaporation is a change of phase from liquid to gas Because the higher energy molecules leave, the process removes energy from the liquid Evaporation is a change of phase from liquid to gas Because the higher energy molecules leave, the process removes energy from the liquid

6. Evaporation Energy Light Bulbs are usually rated by their power consumption in Watts Average household lights range in power from 45W to 150W. Outdoor lights and heating lamps go up to 1200W. Power is the electric energy consumed and leaves the bulb as heat and light. Light Bulbs are usually rated by their power consumption in Watts Average household lights range in power from 45W to 150W. Outdoor lights and heating lamps go up to 1200W. Power is the electric energy consumed and leaves the bulb as heat and light.

7. Lab Variables Independent Variable: Bulb Power Control: No Light 6 trials Dependent Variable: Evaporated Volume Controls: starting temperature, 200ml coffee, same cup Independent Variable: Bulb Power Control: No Light 6 trials Dependent Variable: Evaporated Volume Controls: starting temperature, 200ml coffee, same cup

8. Lab Design None45W60W150W1000W 6 Trials mlevaporated

9. Materials and Procedure 24 Mar, 2001 Keurig Coffee brewer 100ml graduated cylinder desktop lamp 5 bulbs Keurig Coffee brewer 100ml graduated cylinder desktop lamp 5 bulbs

10. Measurements and Observations 100ml graduated cylinder Darker coffee after evaporation Brighter bulbs did keep coffee warmer 100ml graduated cylinder Darker coffee after evaporation Brighter bulbs did keep coffee warmer

11. Evaporated Volume None45W60W150W1000W 1612163044 21215493146 3611133245 4814403647 5517213348 6716243441 Average7.3314.1727.1732.6745.17 Standard Deviation 2.502.3214.252.162.48

12. Evaporated Volume

13. Conclusions The brighter bulbs did have a greater evaporation rate Keeping the coffee warmer seems to help more coffee evaporate The brighter bulbs did have a greater evaporation rate Keeping the coffee warmer seems to help more coffee evaporate

14. To Continue try this again with just plain water to see if the same results occur etc. try this again with just plain water to see if the same results occur etc.

15. Thank You