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Measuring Volume using the Metric System

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Measuring

Volume

using the

Metric System

Alice L. Comisky

VOLUME

Definition- the amount of space a substance takes up

In class you can will be measuring the volume of regular rectangular shaped solid objects, irregular shaped solid objects, and liquid substances.

SECTION 1

VOLUME OF A REGULAR RECTANGULAR

SOLID.

VOLUME OF A REGULAR RECTANGULAR SOLID

tools: metric ruler

units of measure:

cubic centimeter(cm3)-equal to a cube

which measures one centimeter by

one centimeter by one centimeter

To find the volume of a rectangular shaped object multiply the length of the object by the height and width. Volume = l x w x h

5 cm

150 cm3

3 cm

10 cm

Volume = l x w x h

Volume = 10 cm x3 cm x 5 cm =

150 cm3

Use the formula VOLUME = l x w x h, to find the volume of the following 3 objects. (Objects are not drawn to scale.)

1.

3.

36 cm3

3 cm

100 cm3

10 cm

2 cm

6 cm

2.

2 cm

5 cm

2 cm

40 cm3

2 cm

10 cm

What is the volume of this object, in other words how many cubic centimeters does it contain?

Using the formula Volume = l x w x h you will find the volume to be

Count the number of cubic centimeters in the picture to check your answer.

12cm3

SECTION TWO

LIQUID VOLUME

LIQUID VOLUME

tools: graduated cylinder

units of measure:

liter(L)-this is the basic unit of

volume in the metric system

milliliter (mL)-this is the unit of

measure we use most often in

science. 1000 milliliters =1 liter

1 mL is equal to 1 cm3

We use four different size graduated cylinders in science class

100ml50ml 25ml 10ml

To obtain the most accurate measurement, you want to choose the smallest graduated cylinder possible, based on what you need to measure.

Before reading any graduated cylinder you must first determine what each interval on the cylinder represents.

The space between two major markings on this 100 mL graduated cylinder represents 10 milliliters. Each of these major markings is further divided into 10 smaller intervals. 10 millimeters divided by 10 equals 1. Therefore each interval represents 1 mL.

What level is indicated by the red line?

65mL

The space between two major markings on our 50mL graduate cylinder represent five milliliters.

Each of these major markings is further divided into five smaller divisions. By dividing these numbers you get the value of each smaller interval. 5 divided by 5 is 1. Each small interval on the 50 mL graduate is 1mL.

How many milliliters are in this graduated cylinder?

37 mL

The space between two major marking on the 25ml graduated cylinders represents 5 millliliters. Each of these major markings is further divided into to smaller intervals. 5 milliliters divided by 10 equals 0.5. Each interval represents 0.5mL.

At what level is the red line.

.

13.5mL

On the ten milliliter graduate the major markings represent 1 milliliter. Each of these major markings is further divided into 5 smaller intervals. 1milliliter divided by 5 is 0.2 mL

At what level is the red line on each of the following:

72 mL

28 mL

13 mL

6.4 mL

Once you know what each interval marking represents finding the volume of a liquid is easy, all you need to do is pour the liquid into a graduated cylinder and read the volume. Always read the graduated cylinder from eye level.

Each marking on this cylinder represents 1mL. The amount of liquid in the cylinder is 35mL.

You will notice that when a liquid is put into a cylinder, it does something unusual. It curves. This curve is caused by surface tension. When you read the graduated cylinder, you read it at the bottom of the curve. This curve is called the meniscus.

You can clearly see the darker area of liquid, this is the meniscus. Remember to read the level of liquid in a graduated cylinder at the bottom of the meniscus.

How many milliliters of liquid are in this graduated cylinder?

52ml

51ml

50ml

Answer: 59 ml

Quick Review

1. What is the basic unit of volume in the metric system?

Answer:

liter

2. What unit of volume do we most often use in science class?

Answer:

milliliter

3. What tool do we use in class to measure liquid volume.

Answer:

graduated cylinder

4. When reading the level of liquid in a graduated cylinder you should

read the _______of the meniscus.

Answer:

bottom

5.. What unit of measure is equal to 1cm3

1 mL

SECTION 3

VOLUME OF AN IRREGULAR RECTANGULAR

SOLID.

VOLUME OF AN IRREGULAR SOLID

tools: graduated cylinder

UNITS OF MEASURE:

cubic centimeter (cm3)-equal to a cube

which measures one centimeter by one

centimeter by one centimeter

milliliters (mL)- equal in volume to a

cubic centimeter

1. Fill a graduated cylinder with a specific amount of water. (I like to fill it half way.)

2. Record the volume of the water.

3. Place an irregular solid into the cylinder.

4. Record the combined volume of the water and the solid.

5. Subtract the volume of just the water from the combined volume of the water and the solid.

6. The result is the volume of just the irregular shaped solid.

After the small rock is placed in the cylinder the volume rises to 70mL.

The volume of just the water is 50 mL.

Subtract the 50 mL of water from the combined volume of 70 mL. The rock has a volume of 20 mL.

If you still feel you need practice finding the volume of liquids, regular rectangular shaped solids and irregular shaped solids take the time to stay after school for clinic and practice.

Also, it may be helpful to run through this presentation a second time.

GOOD LUCK!

Alice L. Comisky