Density refers to how much stuff (mass) there is in a given volume. Density= mass/volume.
Mass, Volume & Density - nmsby · 2016. 8. 23. · -How much mass is contained in a given...
Transcript of Mass, Volume & Density - nmsby · 2016. 8. 23. · -How much mass is contained in a given...
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Mass, Volume & Density
What is mass?
What is Volume?
What is Density?
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What is Mass?
-The amount of matter an object has.
-Unit of measurement = kg or g
-What tool do we use to find mass?
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What is Volume?
-The quantity of space an object occupies.
-Unit of measurement = ml or cm3
so which one do you use when?
-What tools can we use to find volume?
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Finding Volume of a Regular Shaped Object
-Volume of a cube = L x W x h
-Volume of a cylinder = πr2h
-Volume of a sphere = 4πr3 / 3
Let’s practice! Cube: 2 cm L, 2 cm W, 2 cm h
Did you say 8 cm3?
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Finding Volume of an Irregular Shaped Object
-Can’t use a ruler!!!
-Find volume by water displacement method.
-Volume of water with object – volume of water before object
-Don’t forget to read the graduated cylinder from the bottom of the meniscus!!!
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The correct way to read value at cylinder
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What is the reading on this graduated cylinder?
56 ml
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How about this one?
Be careful!!!
4.3 ml
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Last one!
23 ml
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What is Density?
-How much mass is contained in a given volume.
-Equation: density = mass ÷ volume
d=m/v
-What would the unit of measurement be?
You have to represent both measurements!
g/ml or g/cm3
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Why is Density Important?
-Any ideas?
-Consider 1 kg of iron and 1 kg of cotton….
-Every element has its own unique density. How could that help?
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The Great Archimedes
EUREKA!
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Summary
• Density, d = (Mass, m) / (Volume, v)
• Mass, m = (Density, d) X (Volume, v)
• Volume, v = (Mass, m) / (Density, d)
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Exercise 1
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Exercise 2