G4 SCIENCE PROJECTTemperature vs. Surface Tension of Distilled Water

Kevin Yang| Sehoon Joo| Alan Shen

RESEARCH QUESTION AND VARIABLES• What is the effect of temperature on the

surface tension of distilled water measured by capillary action?

Variables Units Descriptions

Independent Temperature °C Controlled by Bunsen

burner or ice bath

Dependent Surface Tension

mN/m Measured by capillary action

Control

Amount of Water

ml 300ml of water of used for each trial

Source of Water

N/A Watson’s Distilled

Water was used

Temperature of

Surrounding

°C Kept constant by

air conditioning

PROJECT OVERVIEW

RAW DATATrials #1 Capillary

Action ±0.05(cm)#2 Capillary

Action ±0.05(cm)#3 Capillary

Action ±0.05(cm)Tempera

ture ±2(°C)

Tube 1

Tube 2

Tube 3

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Tube 3

10 1.1 2.0 2.0 1.1 2.2 2.0 1.2 2.1 2.2

25 0.6 1.8 2.5 0.9 2.5 1.9 0.8 2.2 2.3

40 0.8 1.2 1.5 0.5 1.6 2.2 0.7 1.4 1.6

55 0.9 2.0 2.3 0.7 2.0 1.7 0.6 1.8 2.0

70 0.4 1.3 2.1 0.5 2.1 2.5 0.6 1.8 2.3

85 0.5 1.5 1.5 0.5 1.7 1.3 0.7 1.6 1.4

ANALYZED DATA

Temperature ±2 (°C)/Average Capillary Action ±0.4 (cm)

Tube 1 Tube 2 Tube 3

10 1.13 2.10 2.0725 0.77 2.17 2.1340 0.67 1.40 1.7755 0.73 1.93 2.0070 0.50 1.73 2.0785 0.57 1.60 1.40

ANALYZED DATA

ANALYZED DATA

Temperature ±2 (°C)/Surface Tension ±2 (mN/m)

Tube 1 Tube 2 Tube 3

10 27.80 51.50 50.6925 18.80 53.14 52.3240 16.35 34.34 43.3355 17.99 47.42 49.0570 12.26 42.51 50.6985 13.90 39.24 34.34

ANALYZED DATA

Average Slope≈-0.16

CONCLUSION• As the temperature increases, the

surface tension of water decreases by 0.16 mN/m per degree rise in temperature