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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
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
Objectives

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

bellwork answers
Bellwork Answers:

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”
slide4

Tool: The Graduated Cylinder

  • 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)
slide5

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
slide6

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

slide7

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
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
slide9

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

slide10

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

practice finding the volume for the next few graduated cylinders
Practice finding the volume for the next few graduated cylinders:
  • In between what two markings does the meniscus fall between?
  • What exact marking does the meniscus touch?
slide12

Practice Problems

  • Between which two markings does the level fall?
  • (Hint: Notice the interval markings)
  • What exact marking does the meniscus touch?
homework
Homework
  • Practice Problems
accelerated bellwork 9 9 09
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 9 091
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
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 objects1
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
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
The Water Displacement Method
  • Step 1 – Measure the volume of water in your graduated cylinder. Record your information.
  • 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
Measuring Volume Lab

Station 1: “Count Your Drops!”

  • 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?
slide21

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
Science 8 Bellwork: 9/9/09
  • Find the volume shown by each of the following graduated cylinders:

C

A

B

science 8 bellwork 9 9 091
Science 8 Bellwork: 9/9/09

A

C

B

  • 9.75 mL
  • 35 mL
  • 6.1 mL
measuring solid objects2
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 objects1
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 method1
The Water Displacement Method
  • Step 1 – Measure the volume of water in your graduated cylinder. Record your information.
  • 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 lab1
Measuring Volume Lab

Station 1: “Count Your Drops!”

  • 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?
slide28

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?