Do You Smell That?Do You Smell That?

ByBy

C. Johns,C. Johns, J. NicholsJ. Nichols, , R. Staneley,andR. Staneley,and K. BerryK. Berry

QUESTIONQUESTION

Do smell thresholds vary among Do smell thresholds vary among students?students?

HypothesisHypothesis Yes, we believe some people Yes, we believe some people

have stronger thresholds of have stronger thresholds of smell than others.smell than others.

ProcedureProcedureMaterials Needed:Materials Needed:

1 . 6 Medicine cups with lids.1 . 6 Medicine cups with lids.

2 . A marker 2 . A marker 3. A measuring cup 3. A measuring cup 4. Mint extract 4. Mint extract

5. A Medicine dropper5. A Medicine dropper

6. Water6. Water

Step- By- Step DirectionsStep- By- Step Directions 1) Get 6 medicine cups with lids and label 1) Get 6 medicine cups with lids and label

them 0-5.them 0-5.2) Fill cup 0 with water .Put on the lid.2) Fill cup 0 with water .Put on the lid.3) Fill measuring cup with 244mL.(8oz)water.3) Fill measuring cup with 244mL.(8oz)water.4) Add two drops of mint extract and stir.4) Add two drops of mint extract and stir.5) Pour water into cup 5.5) Pour water into cup 5.6) Pour out mint water to 120mL. Add water 6) Pour out mint water to 120mL. Add water

until it reaches 240mL. Pour into cup 4.until it reaches 240mL. Pour into cup 4.7) Repeat step six three more times.7) Repeat step six three more times.8) Have each student sniff the cups 8) Have each student sniff the cups

beginning with cup 0 until they identify the beginning with cup 0 until they identify the smell as mint.smell as mint.

9) Record the results and make a bar graph.9) Record the results and make a bar graph.

ControlControl

Our control is cup 0 with no mint Our control is cup 0 with no mint extract.extract.

The amount of water in each cup.The amount of water in each cup.

VariableVariable Our variable is Our variable is the students smell the students smell

thresholds.thresholds.

ResultsResults

The smell thresholds are strongest towards cup fiveThe smell thresholds are strongest towards cup five. .

Smell Thresholds

0

1

2

3

4

5

6

7

8

9

cup 0 cup 1 cup 2 cup 3 cup 4 cup 5Cup Number

Nu

mb

er

Of

Stu

de

nts

ConclusionConclusionWe learned that smell We learned that smell

thresholds for mint vary thresholds for mint vary from student to student.from student to student.