1. The Metric System

2. Way Back When . . .
When people first started to measure things, the systems were different in different parts of the world.
Many systems were based on parts of the body.
Foot Inch

3. History of Metric System
Developed by the French in the late 1700’s.
Based on powers of ten.

4. History of Metric System
Developed by the French in the late 1700’s.
Based on powers of ten.
Used by almost every country in the world, with the notable exception of the USA.
Especially used by scientists.
Abbreviated SI, which is French for Systeme International.

5. Why the Metric System?
NASA still works in imperial units and has had difficulty when needing to work with other groups that use metric
In 1999 the Mars Climate Orbiter was lost because the altitude control system used imperial units (English Standard) and the navigation software used metric.

6. Metric System
Units can be scaled by factors of 10 depending on what you are measuring
So it can be used for small measurements as well as large
Kilo- Hecto- Deca- Base- Deci- Centi- Milli-

7. Measurements
Mass
Weight
Length
Volume
Density

8. Mass
Mass is the amount of matter that makes up an object.

9. Mass Mass is the amount of matter that makes up an object.
A golf ball and a ping pong ball are the same size, but the golf ball has a lot more matter in it. So the golf ball will have more mass.
The mass of an object will not change unless we add or subtract matter from it.

10. Mass Unit used: Gram (g) Tool Used: Balance
A paper clip has the mass of about 1 gram.

11. Weight Weight is a measure of the force of gravity on an object.
Your weight can change depending on the force of gravity. The gravity will change depending on the planet you are on.
The unit for weight is the Newton (N).

12. Weight
Weight is a measure of the force of gravity on an object.

13. Weight and Mass Earth 1 gravity Moon 1/6th gravity Jupiter
2.5 gravities
mass
30kg
weight
300N
50N
750N
Jill’s mass remains the same on earth and the moon, but her weight changes due to different gravitational forces.

14. Length Length is the distance between two points. Unit used: Meter (m)
Tool Used: Ruler or meter stick

15. Volume Volume is the amount of space an object takes up.
Unit used: Liter (l)
Tool Used: graduated cylinder

16. Volume Volume is the amount of space an object takes up.
Unit used: Liter (l)
Tool Used: graduated cylinder
Liquids form a meniscus (curved, upper surface)
To correctly read the volume, read the bottom of the curve.

17. Volume V = Length x Width x Height
We can find the volume of box shapes by the formula:
V = Length x Width x Height
We can use water displacement to find the volume of irregular shaped objects

18. Volume
Ex: We can put water in a graduated cylinder. If a rock causes the level to rise from 7 to 9 ml, the rock has a volume of 2 ml.
1cm3 water =1 ml of water = 1 gram

19. Density
Density is the amount of matter (mass) compared to the amount of space (volume) the object occupies.
Unit for density is g/ml

20. Density
Density is the amount of matter (mass) compared to the amount of space (volume) the object occupies.
Unit for density is g/ml
Equation:

21. Temperature Unit used: Celsius (C) Tool Used: Thermometer
0o Celsius= freezing
100o Celsius= boiling
32o F= freezing point
212o F= boiling point

22. Metric System Base unit Meter (m) Liter (L) Gram (g) 1 Prefix
Abbreviation
Power of 10
Kilo k
1000
Hecto h
100
Deka da 10
Base unit
Meter (m)
Liter (L)
Gram (g) 1
Deci d
0.1
Centi c
0.01
Milli m
0.001

23. Conversions King Henry Died By Drinking Chocolate Milk
If moving to the right, move the decimal to the right that many steps.
If moving the left, move the decimal to the left that many steps.

24. Practice Problems
Convert 15 grams (g) to kilograms (kg)

25. Practice Problems
Convert 115 millimeters (cm) to decimeters (mm).