Effect of Temperature on Shampoo Viscosity: An Experiment, Lecture notes of Chemical Thermodynamics

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Does temperature affect the viscosity of liquids?

• Different liquids have different properties. One of these properties is

viscosity, the liquids resistance to flowing.

• Liquids such as water and milk are thin and flow more easily than

thicker, more viscous liquids such as honey, shampoo or liquid soap.

• Viscosity is an important drilling fluid
• A more viscous fluid is better able to suspend rock cuttings and transport

them to the surface

• Viscous fluids are more difficult to separate from the cuttings
• Temperature effects the viscosity of most fluids

▪ Controlled variables:

(15 oz) Shampoo amount

marble size

▪ Independent variable:

Temperature of the shampoo

Temperature of water

▪ Dependent variable:

Inverting the shampoo bottle

Distance the marble has to travel (11.5 cm)

▪ Clear or light colored shampoo (room temperature) ▪ Two clear plastic water bottles (8 oz.) ▪ Stopwatch ▪ Small marble ▪ Permanent marker ▪ Ruler ▪ Hot water (from faucet is ok) ▪ Large pan ▪ Cold water ▪ Ice cubes ▪ Paper towels ▪ Eye protection (optional)

1. On the side of the bottle 1 in. from each end, draw two lines all the way around with a permanent marker. Measure and record the distance between the lines.
2. Insert the marble into the shampoo at room temperature shampoo. Close the cap tightly.
3. Turn the bottle upside down and observe the marble as it sinks.
4. Invert the bottle once more and use the stopwatch to measure the time it takes the marble to sink down to the middle of the bottle form the top line to the bottom line.
5. Invert the bottle for a total of five measurements. Calculate the average time the marble sunk in the shampoo at room temperature
6. Fill a shallow pan with hot water. Measure the temperature and place the bottle in the pan. Leave the bottle in the hot water for about 15 minutes. Turn the bottle every five minutes to heat the shampoo evenly. Remove the shampoo from the hot water.
7. Invert the bottle for a total of five trials and record the times. Calculate the average time of the marble sinking in the warm water.
8. Fill the pan with cold water and place the bottle in it. Add ice cubes and stir the water gently and record the temperature. Turn the bottle every five minutes to cool the shampoo evenly. Remove the shampoo from the cold water.
9. Invert the bottle for a total of five trials and record the times. Calculate the average time of the marble sinking in the cold water.

Marking the distance for marble to travel. Dropping marble in the shampoo to begin the experiment. Timing the marble in the room temp shampoo Preparing shampoo in cold water. 47 0 F Timing cold shampoo Removing the shampoo from the cold water and inverting the bottle. 9

Timing of marble in cold shampoo. Getting temperature of the hot water. 1030 F Timing the motion of the marble in the shampoo heated in water.

Schlumberger. "Viscosity And Temperature." A Schlumberger non-profit community development program. 21 Nov. 2007. Grubbs, W. "Viscosity of simple liquids: temperature variation." Stetson University. 21 Nov. 2007.