PJAS Presentation Format

The Effect of Light Power On The Evaporation Rate of Coffee

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

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

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

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.

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

Lab Design None45W60W150W1000W 6 Trials mlevaporated

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

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

Evaporated Volume None45W60W150W1000W Average Standard Deviation

Evaporated Volume

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

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.

Thank You