using a graduated cylinder
TRANSCRIPT
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Measuring Volume of Liquids
To measure the volume of a liquid, we use a tool called a graduated cylinder.
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Using a Graduated Cylinder
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Using a Graduated CylinderThe markings on a gradulated cylinder
tell you its size: “100:1”ml near the top means it
measures 100 milliliters and has a marking every one milliliter increment.
When you read it, you can count by ones!
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Size of a Graduated Cylinder
100:1ml
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Using a Graduated Cylinder• “250:5”means it
measures 250 milliliters and has a marking at every five milliliter increment. To read this one, you must count by fives!
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Using a Graduated Cylinder• What would you count by to read the
graduated cylinders below?
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Using a Graduated Cylinder• What would you count by to read the
graduated cylinders below?
100:10 means count by 10’s!
50:2 and 100:2mean count by 2’s!
250:5 means count by 5’s!
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How to read the volume of a liquid in a graduated cylinder
The meniscus is the U-shaped “the upper surface of a liquid in a tube”.
Meniscus
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How to read the volume of a liquid in a graduated cylinder
1. Always measure volume in a graduated cylinder at the bottom of the meniscus.
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How to read the volume of a liquid in a graduated cylinder
2. Always look straight from the side of the meniscus at the graduated cylinder to measure volume. (Never try to read from above or below.)
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Reading a graduated cylinder’s volume
From above meniscus WRONG!!!!! From below meniscus
WRONG!!!!!
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Reading a graduated cylinder’s volume
From the side of the meniscus CORRECT!!!
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What volume of liquid is in these graduated cylinders?
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What volume of liquid is in these graduated cylinders?
9.4 mL 71 mL 33 mL 17 mL
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Measuring volume of an irregularly-shaped object
1.Put a moderate amount of water in a graduated cylinder and measure the volume.
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Measuring volume of an irregularly-shaped object
2. Place the object in the graduated cylinder with the water.
3. Measure the volume of the water in the graduated cylinder with the object submerged in it.
(rock)
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Measuring volume of an irregularly-shaped object
4. Subtract the volume of just the water from the volume of the water with the object submerged. This value tells you the volume of the object.
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Measuring volume of an irregularly-shaped object
For example, if there is 58ml of water in a graduated cylinder and you add an object, then the volume of the water and the object is 56 ml. What is the volume of the object?
58ml (volume of water with object submerged)-56ml (volume of just the water)
2ml (volume of object)