PJAS Presentation

Format

PJAS Presentation

Format

The Effect of Light Power On

The Evaporation

Rate of Coffee

The Effect of Light Power On

The Evaporation

Rate of Coffee

PurposePurpose

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

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

Hypothesis:Hypothesis:•If a bulb of greater

power is used to warm coffee, then more of the coffee will evaporate.

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

Evaporation EnergyEvaporation 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 EnergyEvaporation EnergyLight 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 VariablesLab 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 DesignLab Design

NoneNone 45W45W 60W60W 150W150W 10001000WW

6 Trials6 Trials

ml ml evaporateevaporate

dd

Materials and ProcedureMaterials and Procedure24 Mar, 200124 Mar, 2001

Keurig Coffee brewer

100ml graduated cylinder

desktop lamp

5 bulbs

Keurig Coffee brewer

100ml graduated cylinder

desktop lamp

5 bulbs

Measurementsand

Observations

Measurementsand

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 VolumeEvaporated VolumeNoneNone 45W45W 60W60W 150W150W 1000W1000W

11 6 12 16 30 4422 12 15 49 31 4633 6 11 13 32 4544 8 14 40 36 4755 5 17 21 33 4866 7 16 24 34 41

AveraAveragege

7.3314.1

727.1

732.6

745.1

7Standard Standard DeviationDeviation

2.50 2.32 14.25 2.16 2.48

Evaporated VolumeEvaporated Volume

ConclusionsConclusions

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 ContinueTo 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 YouThank You