1. AIM: How is the volume of irregularly shaped objects measured?
VOCABULARY
Irregular shaped object
Meniscus
Increment
Graduated Cylinder
Overflow Can
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2. OBJECTIVE
To successfully and accurately read the level in a graduated cylinder and measure the volume of irregularly shaped objects.
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3. DEFINITION What is volume ?
Volume is the amount of space that matter (a solid, a liquid or a gas) takes up.
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4. For liquids, the standard (base) unit of measure for volume is the…
In the Metric System
For liquids, the standard (base) unit of measure for volume is the…
Liter
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5. Basic Terminology 1 liter = 1000 milliliters 1 L = 1000 mL
Remember…a milliliter takes up the SAME AMOUNT OF SPACE as a cubic centimeter (cm3)
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6. Metric Tool for Measuring Volume
Graduated Cylinder
In order to accurately use a graduated cylinder, there are a few important things to remember!!!
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7. What is the Meniscus?
You have to read the level of the water at the meniscus
What is a meniscus?
A curve or blur in the water level
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8. Why do you think its important to read the meniscus at eye level?
What is the Meniscus?
Why do you think its important to read the meniscus at eye level?
To obtain an accurate reading
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9. What is the Meniscus?
Why should we keep the Graduated Cylinder as flat as possible during reading?
To make sure that the level is even and the liquid level is accurate
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10. Lets Practice reading a graduated cylinder:
The increment could be DIFFERENT on each cylinder
Sometimes the increment is 1mL, other times its 5mL or even 0.5mL or 0.1 mL!
You have to check!
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11. Lets Practice reading a graduated cylinder:
What is the increment of this cylinder?
What is the volume?
Top of meniscus
Bottom of meniscus
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12. Lets Practice reading a graduated cylinder:
What’s the increment of this cylinder?
What is the volume? 6
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13. Lets Practice reading a graduated cylinder:
What’s the increment of this cylinder?
What is the volume?
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14. Lets Practice reading a graduated cylinder:
What’s the increment of this cylinder?
What is the volume?
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15. Lets Practice reading a graduated cylinder:
What’s the increment of this cylinder?
What is the volume?
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16. What is this called?
A rock
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17. How can you measure its volume?
Can you measure its height, width, and length with a ruler?
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18. So how do you measure its volume?
Water displacement method
You’ll need a graduated cylinder or an overflow can
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19. Water Displacement Method
Using your graduated cylinder
Step 1: measure the volume of water
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20. Water Displacement Method
Step 2: insert the rock in the water
Re-measure the water in the cylinder!
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21. Water Displacement Method
Step 3: Subtract the first measurement from the second.
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22. Water Displacement Method
The difference in the measurements is the volume of the rock in mL
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23. Water Displacement Method
…and since we know that 1mL = 1cm3, we know the volume of the solid object in 2 units!!!
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