- By
**nia** - Follow User

- 89 Views
- Uploaded on

Download Presentation
## Bellwork: 9/8/09

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

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?

- 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)

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

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

- 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

- 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

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?

- 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 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

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?

- 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?

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 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

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?

- 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?

Download Presentation

Connecting to Server..