1. With a graduated cylinder
MEASURING volume
With a graduated cylinder
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2. The amount of 3 dimensional space occupied by an object.
What is volume?
The amount of 3 dimensional space occupied by an object.
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3. Measuring volume
In this lesson, we will be measuring the volume of a liquid using a graduated cylinder.
To read the volume of a liquid you must read the measurement based on the bottom of the meniscus.
Show students an empty graduated cylinder.
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4. What causes the meniscus?
A meniscus can occur with a liquid in any container. You’ll notice the meniscus on the curved surface of a column of liquid. It is a concave meniscus if the molecules of the liquid are attracted to the container walls and convex if they are not.
Concave meniscus
Demonstrate placing the graduated cylinder on a level surface and getting down at eye level to “pretend” reading a volume.
you must read the graduated cylinder at eye-level to record the most accurate measurement.
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5. Metric units & Measuring volume
The graduated cylinders we will use today will measure in milliliters (mL), which are metric units.
How many milliliters of liquid are in this cylinder?
_______
20 mL
Ask students the question on the slide and then allow for students to answer. Once students have answered click to show the answer.
1 liter (L) = 1000 milliliters (mL)
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6. Measuring volume
To measure a liquid, you first carefully pour it into the graduated cylinder. Tipping the cylinder gently to one side will help the liquid not splash out and prevent bubbles from forming. Then, at eye-level, read the liquid volume at the bottom of the meniscus.
Demonstrate doing this for students using the teacher demonstration irregular shaped jar. Demonstrate each step of taking the measurement.
Always make sure that your graduated cylinder is sitting on a level surface to ensure an accurate measurement.
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7. Let’s Practice! 43 mL _________
Look at the graduated cylinder below, what is the volume of the liquid inside?
_________
43 mL
Have students practice reading the volume and allow them to share their answers. Click to view the answer.
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8. Measuring volume Jar #1 Jar #2 Jar #3 Jar #4 Volume Measurement
Now we will practice measuring various volumes of liquids. Draw the following chart in your science journal. Measure the volume of the liquid in each jar using your graduated cylinder. Be sure to account for the meniscus!
Jar #1
Jar #2
Jar #3
Jar #4
Volume Measurement
____ mL
        ____ mL
Now organize the jars from the least amount of volume to the most by listing them in order in your science journal.
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9. Let’s review… 1. What is volume?
The amount of 3 dimensional space occupied by an object.
2. What metric unit did we measure with?
milliliters.
3. How do you read a graduated cylinder?
At eye-level and read the bottom of the meniscus.
4. What should you do with the graduated cylinder before measuring the volume of a liquid?
Read each question and allow students to share answers before clicking to the answer, click again to show the next question.
Make sure it’s sitting on a level surface.