Introduction
In this experiment, we will determine the effect of temperature on the viscosity of a liquid. We will be performing this experiment by making a viscometer at home.
Aim
To determine how the viscosity of a liquid gets affected by its temperature.
Theory
1. The property of a liquid that resists its flow is termed Viscosity.
2. On increasing the temperature of a liquid, its potential and kinetic increase as well, which results in the free movement of molecules. This causes the liquid to flow easily.
Requirements
1. Canola oil
2. Corn syrup
3. Molasses
4. Water
5. Dishwashing liquid
6. Homemade viscometer
7. Notebook
Procedure
Step 1: Make a viscometer at home.
Step 2: Test five different liquids (water, dishwashing liquid, homemade viscometer, molasses, corn syrup) in the viscometer.
Step 3: Test each liquid at three different temperatures that are 60 degrees Fahrenheit, 45 degrees Fahrenheit, and 95 degrees Fahrenheit.
Step 4: Measure the time each liquid takes to flow from the viscometer.
Step 5: Perform this experiment three times for each of the liquids.
Step 6: Divide the volume of liquid flowing through the viscometer by the average time taken by that liquid in minutes. This will give us the flow rate of liquid in liters per minute.
Step 7: Calculate the relative viscosity of each liquid.
Step 8: Compare the flow rate of each of the liquids.
Step 9: Record your observations.
Observation
1. We observed that the flow rate of all five liquids depended on the temperature.
2. On increasing the temperature, we found the viscosity of the liquid decreases.
3. On decreasing the temperature, we found that the viscosity of the liquid increased.
4. We also observed some changes in the relative viscosity of all five liquids by changing their temperature.
Result
1. Viscosity of a liquid is inversely proportional to the temperature.
2. On heating, the molecules of water get far from each other, giving each other some extra space to flow easily.
3. There is an essential need to accurately calculate a liquid’s viscosity as it helps design some instruments like pumps, valves, and pipes.
Precaution
1. Take help from your parents in building a viscometer.
2. Do not heat the given liquids at high temperatures.
Conclusion
In this experiment, we determined how the flow of liquid gets affected by the temperature.
Viva Questions With Answers
Q.1 What was the aim of your experiment?
ANS. We aimed to determine how temperature affects the flow rate of liquid, that is, its viscosity.
Q.2 How does the temperature affect the viscosity?
ANS. On increasing the temperature of a liquid, its viscosity decreases, i.e., its flow rate increases. And on decreasing the temperature of a liquid, its viscosity increases, i.e., flow rate decreases.
Q.3 How does the temperature depend on the flow rate of a liquid?
ANS. Temperature is directly proportional to the flow rate of a liquid.
Saquib Siddiqui is a Mechanical Engineer and a content creator. He has special interest in science experiments and teaches the same to school and college students. He is also a technical lead at RUDE LABS PVT. LTD.
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