1. Measuring Using the Metric System!

2. Three ways to use the metric system
Length
Volume
Mass

3. Units for Length, Volume, and Mass
Length-Meter (m)
Mass-Gram (g)
Volume-Liter (L)

4. Length

5. The measurement of a distance from one point to another.
Length
The measurement of a distance from one point to another.

6. Use a ruler or meter stick
Ways to Measure Length
Use a ruler or meter stick

7. English vs. Metric Units
Which is longer?
A. 1 mile or 1 kilometer
B. 1 yard or 1 meter
C. 1 inch or 1 centimeter
1.6 kilometers
1 mile
1 yard = meters
1 inch = 2.54 centimeters
Left Image: Right Image:

8. SI unit for Length Kilometer (km)-compares to a mile
Meter (m)- compares to a yard
Centimeter (cm)- compares to an inch
Millimeter (mm)- for really tiny distances
PRACTICE: Which unit would you use to measure a length of a thumb tack?

9. Special Note!!!
Whenever you see a “m” by itself, it will stand for meter, and not milli.

10. Measuring Length How many millimeters are in 1 centimeter?
1 centimeter = 10 millimeters
How many millimeters are in 1 centimeter?
What is the length of the line in centimeters? _______cm
What is the length of the line in millimeters? _______mm
What is the length of the line to the nearest centimeter? ________cm
HINT: Round to the nearest centimeter – no decimals.
Ruler:

11. Mass

12. Mass
A measure of the amount of matter in an object.

13. 3 Types of Matter
1.) Solid-matter that has definite shape and definite volume
2.) Liquid-matter that has definite volume, but not definite shape
3.) Gas-matter that has no definite shape or volume

14. Ways to measure mass
Use a balance or an electronic scale

15. English vs. Metric Units
1 pound = grams
Which is larger?
1. 1 Pound or 100 Grams
2. 1 Kilogram or 1 Pound
3. 1 Ounce or 1000 Milligrams
100 kilogram = 220 pounds
1 ounce of gold = 28,349.5 milligrams

16. SI unit for mass Kilogram (kg)-compared to a pound
Gram (g)-compared to an ounce
Practice: Which unit would you use to measure a pill?

17. _______ + ______ + _______ = ________ g
Measuring Mass
We will be using triple-beam balances to find the mass of various objects.
The objects are placed on the scale and then you move the weights on the beams until you get the lines on the right-side of the scale to match up.
Once you have balanced the scale, you add up the amounts on each beam to find the total mass.
What would be the mass of the object measured in the picture?
_______ + ______ + _______ = ________ g
Top Image: Bottom Image:

18. Measuring Mass – Triple-Beam Balance
1st – Place the film canister on the scale.
2nd – Slide the large weight to the right until the arm drops below the line. Move the rider back one groove. Make sure it “locks” into place.
3rd – Repeat this process with the top weight. When the arm moves below the line, back it up one groove.
4th – Slide the small weight on the front beam until the lines match up.
5th – Add the amounts on each beam to find the total mass to the nearest tenth of a gram.

19. Mass vs. Weight
Mass and weight get confused. Weight is the downward force exerted by an object due to gravity. Mass is the amount of matter in an object. (If you were in outer space, you would weigh less, but still have the same mass as you would on Earth)

20. Volume
Solid vs. Liquid

21. The amount of space an object takes up (physical property)
Volume
The amount of space an object takes up (physical property)

22. Tools used to measure volume
Beaker Florence Flask
Erlenmeyer Flask Graduated Cylinder

23. English vs. Metric Units
Which is larger?
A. 1 liter or 1 gallon
B. 1 liter or 1 quart
C. 1 milliliter or 1 fluid ounce
1 fl oz = ml
1 12-oz can of soda would equal approximately 355 ml.
1 gallon = 3.79 liters
It would take approximately 3 ¾ 1-liter bottles to equal a gallon.
1 quart = liters

24. SI ( System International) Unit for volume
Solid-Cubic Meter (m³)
cm³ is more commonly used
Liquid-
Liter (L)-compared to gallons
Milliliter (mL)- compared to fluid ounces
Using Liquid Displacement
1mL = 1 cmᵌ

25. Ways to measure solid volume
1.) Formula :
Volume = Length x Width x Height
2.) Liquid Displacement- (For or an object that cannot be measured by length, width, and height.)
Put a measurable amount of water into a graduated cylinder, record the amount of water, place the object in the cylinder, record where the new amount of water is, subtract the second measurement from the first measurement=Volume!)

26. Measuring Solid Volume
10 cm
9 cm
8 cm
We can measure the volume of regular object using the formula length x width x height.
_____ X _____ X _____ = _____
We can measure the volume of irregular object using water displacement.
Amount of H2O with object = ______ About of H2O without object = ______ Difference = Volume = ______
Click here for an online activity about volume. Choose Lessons  Volume & Displacement

27. Reading a graduated cylinder
Graduated Cylinders come in all shapes and sizes and are measured in ml.
Water molecules attract to the glass causes the water surface to curve, therefore to measure accurately, one must look at the meniscus at eye level.
Therefore, when measuring,
measure at the bottom of the
meniscus or curve.

28. Measuring Liquid Volume
What is the volume of water in each cylinder?
Images created at A B C