1. Date your Science Jolt Entry Sep 16 and complete the following:
cm = _____ mm
mm = _____ cm
cm = _____ m
19 cm = _____ mm = ______ m

2. What common object is about this size?
1 cm cubed = 1 mL
What common object is about this size?
die

3. Graduated Cylinder Collar should be placed toward the top.
This collar will not protect the glass cylinder if it tips.

4. Be careful with the numbers…they often go in both directions!
Beaker
Be careful with the numbers…they often go in both directions!

5. Mass is the amount of “stuff” in something.
1mL has a mass of 1 g
Mass is the amount of “stuff” in something.
1 mL of pure water has a mass of one gram
(at 4 oC)
die

6. Mass Mass - the amount of matter or “stuff” in an object.
Basic unit of mass is the gram (g)
One large paperclip has a mass of about 1 gram
Measured with a balance (electric or triple beam)
(In Physics, mass is usually referred to in kilograms.)

7. Electronic Scale: Set to Zero
Make sure that your units are on grams.

8. Baseball
145 g
Prius
1,325 kg
Labrador
34 kg
Mass of Earth
5.972 × 10^24 kg

9. Metric Prefixes kilo k- 1,000 hecto h- 100 deka da- 10 (base)
no prefix 1
deci- d-
0.1
centi- c-
0.01
milli m-
0.001

10. Basic
unit
Unit x 1000
kilo -
Unit ÷ 100
centi -
Unit ÷ 1000
milli -
Length
Meter m
kilometer km
centimeter cm
millimeter mm
Volume
Liter L
kiloliter kL
centiliter cL
milliliter mL
Mass
Gram g
kilogram kg
centigram cg
milligram mg

11. The difference between mass and weight
Weight - measure of the force of gravity acting on an object. If you go to the moon where the gravity pulls down six times less than on Earth, your weight would be 1/6, but your mass would be the same.
60 pounds (267 N)
10 pounds (45 N)
27kg
27kg

12. Advantages of the SI So why don’t we use SI in our everyday life?
Universal language for all scientists
Easy to use and convert
Units relate to each other (m, g, L)
Global citizens
So why don’t we use SI
in our everyday life?
Expensive to retool factories, signage, etc.
We think in terms that are familiar to us.