AIM: How is the volume of irregularly shaped objects measured?€¦ · AIM: How is the volume of...
Transcript of AIM: How is the volume of irregularly shaped objects measured?€¦ · AIM: How is the volume of...
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AIM: How is the volume ofirregularly shaped objects measured?
VOCABULARY
Irregular shaped object Meniscus Increment Graduated Cylinder Overflow Can
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OBJECTIVE
To successfully and accuratelyread the level in a graduated
cylinder andmeasure the volume of
irregularly shaped objects.
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DEFINITION
What is volume ?
Volume is the amount ofspace that matter (a solid, a
liquid or a gas) takes up.
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In the Metric System
For liquids, the standard(base) unit of measure for
volume is the…
Liter
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Basic Terminology
1 liter = 1000 milliliters
1 L = 1000 mL
Remember…a milliliter takes upthe SAME AMOUNT OF SPACE
as a cubic centimeter (cm3)
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Metric Tool for Measuring Volume
Graduated Cylinder
In order to accurately use agraduated cylinder, there are a
few important things toremember!!!
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What is the Meniscus?
You have to readthe level of thewater at themeniscus
What is ameniscus?
A curve or blur inthe water level
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Why do you thinkits important toread the meniscusat eye level?
To obtain anaccurate reading
What is the Meniscus?
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Why should we keepthe GraduatedCylinder as flat aspossible duringreading?
To make sure thatthe level is even andthe liquid level isaccurate
What is the Meniscus?
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Lets Practice reading a graduatedcylinder: The increment
could beDIFFERENT on
each cylinder
Sometimes theincrement is 1mL,other times its 5mLor even 0.5mL or
0.1 mL!You have to check!
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Lets Practice reading a graduatedcylinder:
What is theincrement ofthis cylinder?
What is thevolume?Bottom of meniscus
Top of meniscus
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Lets Practice reading a graduatedcylinder:
What’s theincrementof thiscylinder?
What is thevolume?
6
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Lets Practice reading a graduatedcylinder:
What’s theincrement ofthis cylinder?
What is thevolume?
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Lets Practice reading a graduatedcylinder:
What’s theincrement ofthis cylinder?
What is thevolume?
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Lets Practice reading a graduatedcylinder:
What’s theincrement ofthis cylinder?
What is thevolume?
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What is this called?
A rock
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How can you measure its volume?
Can youmeasure itsheight, width,and length witha ruler?
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So how do you measure its volume?
Waterdisplacement
method
You’ll need agraduated
cylinder or anoverflow can
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Water Displacement Method
Using yourgraduatedcylinder
Step 1: measurethe volume ofwater
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Water Displacement Method
Step 2: insertthe rock in thewater
Re-measure thewater in thecylinder!
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Water Displacement Method
Step 3: Subtractthe firstmeasurementfrom thesecond.
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Water Displacement Method
The differencein themeasurementsis the volume ofthe rock in mL
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Water Displacement Method
…and since weknow that1mL = 1cm3,
we know thevolume of thesolid object in 2units!!!