Viscosity

Gale Hunter Dyett Middle School
555 E. 51st. Street
Chicago, IL 60615
(312) 535-1825

Objective:

Discover what viscosity is and how it relates to our lives.

Materials:

A device that will allow two or more liquids of different viscosity the
opportunity to flow at the same time: marbles, wind-up-toy, timer, funnel, eye
dropper, toy car, one uncarpeted board, one carpeted board, soap, chop sticks,
empty container, small closed containers of different viscosity liquids, large
containers of different viscosity liquids, six same size dictionaries, Kyro
syrup 100%, Kyro syrup mixed with water 75%, 50%, 25% and water (100%).

Strategy:

1. Briefly discuss the difference between quantitative and qualitative data.
Relate the discussion to the following experiments.

2. Discover friction: create two ramps with the books and the boards. Release
the toy car on the uncarpeted board first, then the carpeted board. Ask the
students why one is slower. Discuss what happens.

3. Discover the results of friction: Have students rub their hands together.
Discuss what happens. Rub the chop sticks together and touch them to the area
below the nose. Discuss what happens. Rub the chop sticks with soap and then
together and touch them to the area below the nose. Discuss the results.

4. Turn the small containers over allowing the liquids to flow. Point out the
movement of the air bubble in each liquid. Discuss what happens.

5. Five groups of students: 0% (Water 100%), 25%, 50%, 75%, 100% Kyro Syrup.

6. Students will time how many drops of liquid comes out of a dropper in ten
seconds. Discuss the results.

7. Students will drop marbles into the large containers of liquids and time how
long it takes the marbles to travel to the bottom. Five marbles should be timed
and an average time computed.

8. Data is collected in a table on the board by students. Each group should
discuss their results. The total findings should be discussed.

9. Discover how engines work with different viscosities: Pour the liquids into
the empty containers. Wind up the toys and put it into the liquids. Discuss
the results.


Conclusion:

Through the step by step discussions, students should begin to realize that
viscosity is one of the most important properties of lubricating oil. Viscosity
is a measurement of resistance to flow or how thick or thin an oil is. Lubricant
flow characteristics are relative to temperature. When temperature is
increased, viscosity is decreased and vice-versa. Students should understand
the motion of molecules in matter before and after heat is applied.

Reference:

Professional Service Industries Inc. TAI/FABER Division Lab.
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