What is the Viscosity of Oil and Other Liquids?

Answer 1

Determine Flow Rate

Problem- What is the rank from the most viscous to the least viscous? (Molasses, glycol, motor oil, ethyl alcohol.)

Hypothesis-If we test the viscosity of all the liquids, then from the least viscous to the most viscous it would be ethyl alcohol, motor oil, glycol and molasses. I think this because the higher the viscosity is the slower the liquid will move. The lower the viscosity is, the liquid will move faster.

Materials-

ü Molasses

ü Glycol

ü Motor oil

ü Ethyl alcohol

ü Funnel

ü Test tube

ü Test tube brush

ü Inclined plain

ü Apron

ü Towel

ü Paper towel

ü Water

Procedure-

1. Put on apron.

2. Measure the same amount of each liquid and put it in different test tubes.

3. Pile up 5 textbooks and place inclined plain on the pile of books.

4. Measure 30 centimeters from top of inclined plain.

5. Pour molasses.

6. Record how much time it takes to flow 30 centimeters.

7. Clean inclined plain.

8. Repeat step 5-7 three times with the three other liquids.

9. Record observations.

Results-

Controlled Variables- Amount of liquid, temperature,

Manipulated Variables- type of liquid.

Responding Variables-

Two possible errors-We might have made an error when we timed the molasses. We might have been a little off. The temperature could have affected the viscosity of the liquid. At the beginning of the lab, it was warmer than during the focus of the lab. To make the timing better and more precise we could have used a stopwatch.

Manipulated Variable- Also known as Independent Variable, This is what the scientist purposely changes

Controlled Variable- Variable that stays the same

Responding Variable- Variable that May (usually) or may not change.

High Viscosity = Slow

Low Viscosity = Fast