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Bellwork: 9/8/09. What is volume? How could you find the volume of a glass of water? How could you find the volume of a penny?. Objectives. I will accurately measure the volume of a liquid using a graduated cylinder. Bellwork Answers:. What is volume?

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## Bellwork: 9/8/09

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Bellwork: 9/8/09
• What is volume?
• How could you find the volume of a glass of water?
• How could you find the volume of a penny?
Objectives

I will accurately measure the volume of a liquid using a graduated cylinder

What is volume?

• Volume – (def.) the amount of space an object takes up

How could you find the

volume of a glass of

water? A penny?

• Glass of water – measure out the volume using a graduated cylinder
• Penny – use the “Water Displacement Method”

• Graduated cylinder (def) – A cylindrical tool used to measure the volume of liquids and irregular solids
• Found in various sizes to hold different volumes of liquid
• Measured in liters (L)

What is a liter?

cL

kL

mL

L

• Metric Benchmark:
• The base unit used to measure volume in the metric system is the liter (L)
• The volume of 1 liter was determined by calculating the size of one cubic decimeter
• 10 cm x 10 cm x 10 cm = 1000 cm³ = 1L

Standard vs. Metric

1 fl oz = 29.573 mL

One 12-oz can of soda would equal approximately 355 mL

1 quart = 0.946 liters

1 gallon = 3.79 liters

It would take approximately 3 ¾ 1-liter bottles to equal a gallon.

Which is larger?

A. 1 liter or 1 gallon

B. 1 liter or 1 quart

C. 1 milliliter or 1 fluid ounce

So How big is a Liter?

• 1 milliliter (mL) = 1 cm3 (or cc) = 1 gram*
• 5 milliliter (mL) = 1 teaspoon
• 15 milliliter (mL) = 1 tablespoon
• 240 milliliter (mL) = 1 cup
• 1 liter (L) = 1000 milliliters (mL)
• 3.8 liters (L) = 1 gallon
To find the volume of a liquid…
• Pour the liquid into a graduated cylinder
• (Be sure to use a measuring tool that is close in size to the object you are measuring! )
• Look at the water at eye level
• If you look closely you will see that the surface of the water is not straight across, but curves slightly
• This curve is called a “meniscus”
• Read the line where the meniscus touches as the volume of liquid being measured

What is a meniscus?

• The meniscusis (def.) the concave surface of a liquid used to determine volume in a graduated cylinder
• To read the meniscus, look at the lowest point of the curve at eye level.

*The meniscus forms when the molecules of the liquid become attracted to side of the container that holds them

Step 1:Find the two labels surrounding the water level.

*The meniscus is between 50 mL and 60 mL

Step 2:Use the labels to find the nearest graduated increment. Count up from the smaller line.

*The meniscus is between 52 mL and 53 mL

Step 3: Estimate the water level as accurately as possible based on the placement of the meniscus on the line.

*The meniscus is about ¾ of the way between 52 mL and 53 mL, so the final reading would be 52.75 mL

• In between what two markings does the meniscus fall between?
• What exact marking does the meniscus touch?

Practice Problems

• Between which two markings does the level fall?
• (Hint: Notice the interval markings)
• What exact marking does the meniscus touch?
Homework
• Practice Problems
Accelerated Bellwork: 9/9/09
• Find the volume shown in each of the following graduated cylinders:
• Write your units in mL, cL, dL and L

A

C

B

Accelerated Bellwork: 9/9/09

C

A

• 52.75 mL
• 5.275 cL
• 0.5275 dL
• 0.05275 L
• 6.6 mL
• 0.66 cL
• 0.066 dL
• 0.0066 L

B

• 76 mL
• 7.6 cL
• 0.76 dL
• 0.076 L
Measuring Solid Objects
• Technique 1: To find the volume of a Rectangular Prism…
• Multiply the length (l) x width (w) x height (h)
• What is the volume of thisrectangular prism?
• l = 5 cm, w = 4 cm, h = 10 cm
• 5 cm x 4 cm x 10 cm
• 200 cm³

h

w

l

Measuring Solid Objects
• Technique 2: To find the volume of a Cylindrical Prism…
• Multiply ∏ r² h
• What is the volume of thiscylindrical prism?
• ∏ = 3.14
• r = 5 cm
• h = 6 cm
Measuring Irregular Solid Objects
• Technique 3: To find the volume of an irregularly shaped object, you must use a method called the “Water Displacement Method”
• How do I find the volume of this modeltriceratops??
The Water Displacement Method
• Step 2 – Place the solid object into the cylinder.
• Step 3 – Measure the new water level.
• Step 4 – Subtract the old water level from the new water level. You now have the volume of the solid object.

New Volume – Old Volume = Difference (Volume of object being measured)

Measuring Volume Lab

• Problem to solve…How many drops of water will it take to equal 1 milliliter?

Station 2: “Water Displacement”

• Problem to solve…What is the volume of 1 marble? 2 marbles? 3 marbles?

Station 3: “Volume by Formula”

• Problem to solve…What is the volume of each of the objects on your table?

Practice Problems:

• What is the volume of a marble if the original water level measured 40 ml, and the level after the marble was added raised to 56.5 ml?
• What is the final water level if an eraser with a volume of 4.0 ml is added to a graduated cylinder containing 25 ml of water?
• What is the volume of a penny if it raises the water level by 7.2 ml?
Science 8 Bellwork: 9/9/09
• Find the volume shown by each of the following graduated cylinders:

C

A

B

Science 8 Bellwork: 9/9/09

A

C

B

• 9.75 mL
• 35 mL
• 6.1 mL
Measuring Solid Objects
• Technique 1: To find the volume of a Rectangular Prism…
• Multiply the length (l) x width (w) x height (h)
• What is the volume of thisrectangular prism?
• l = 5 cm, w = 4 cm, h = 10 cm
• 5 cm x 4 cm x 10 cm
• 200 cm³

h

w

l

Measuring Irregular Solid Objects
• Technique 2: to find the volume of an irregularly shaped object, you must use a method called the “Water Displacement Method”
• How do I find the volume of this modeltriceratops??
The Water Displacement Method
• Step 2 – Place the solid object into the cylinder.
• Step 3 – Measure the new water level.
• Step 4 – Subtract the old water level from the new water level. You now have the volume of the solid object.

New Volume – Old Volume = Difference (Volume of object being measured)

Measuring Volume Lab

• Problem to solve…How many drops of water will it take to equal 1 milliliter?

Station 2: “Water Displacement”

• Problem to solve…What is the volume of 1 marble? 2 marbles? 3 marbles?

Station 3: “Volume by Formula”

• Problem to solve…What is the volume of each of the objects on your table?

Practice Problems:

• What is the volume of a marble if the original water level measured 40 ml, and the level after the marble was added raised to 56.5 ml?
• What is the final water level if an eraser with a volume of 4.0 ml is added to a graduated cylinder containing 25 ml of water?
• What is the volume of a penny if it raises the water level by 7.2 ml?