1. Units Of Measurement

2. Measurement Quantitative data (represents quantities)
Quantity: something that has magnitude, size or amount
Example:
a box has a quantity that is represented by volume
A track has a quantity that is represented by meters or miles

3. SI Measurement International Standards of Measurement
There are 7 SI Base Units

4. SI Base Units QUANTITY SYMBOL BASE UNIT NAME & Symbol length l
Meter (m)
Mass m
Kilogram (kg)
Time t
Seconds (s)
Temperature T
Kelvin (K)
Amount of Substance n
Mole (mol)
Electric Current I
Ampere (A)
Luminous intensity Iv
Candela (cd)

5. REMEMBER
Meters = m
Liters = L
Grams = g
Seconds = s

6. SI Base Units (Common)
Mass: the quantity that measures how much matter
Base: gram
Weight: A measure of gravitational pull on matter
Length: the quantity that measures distance
Base: meter,

7. SI Prefixes Each Base Unit can carry with it a number of prefixes
Each prefix represents a quantity larger or smaller than the Base Unit
There are 8 prefixes you need to learn

8. SI Prefixes

9. SI Prefixes You will be asked to convert from one unit to another
The largest numbers are at the top of the chart (mega), the smallest numbers are at the bottom of the chart (micro)

10. SI Prefixes
When you move UP the chart from a smaller number to a larger number MOVE THE DECIMAL TO THE LEFT
When you are moving DOWN the chart from a large number to a smaller number MOVE THE DECIMAL TO THE RIGHT

11. Lets try It !!! 2300 kilometers = 230000 dekameters
2300 kilometers to dekameters
Decide which way to move your decimal
(Move right)
Next count how many unit difference it is from kilo to deka 2
2300 kilometers = dekameters

12. Practice these next few conversions!
3.25 micrograms --> dekagrams
kiloliters --> gigaliters
33.25 centimeters --> hectometers
650 meters --> millimeters
68520 picoliters --> deciliters

13. Answers Decimal to left 7 places: .000000325 dekagrams
Decimal to left 6 places: gigaliters
Decimal to left 4 places: hectometers
Decimal to the right 3 places: millimeters
Decimal to left 11 places: deciliters

14. Derived Units
Combination of units
Ex: m2, g/mL, etc.

15. Volume Volume is a derived unit:
Length x width x height
Units: (m) x (m) x (m) = m3 (cubic meter)
Or (cm) x (cm) x (cm) = cm3 (cubic centimeter)

16. Density
Density is a derived unit:
Density = mass / volume
= “stuff”/”space”
Units for density could be g/L, kg/m3 or g/cm3
Be sure you know which units you are using in your equation and be consistent in your answer

17. Density Wheel
The wheel is a quick way to determine what you are solving for
Using the wheel:
1.) Cover the variable that you are solving

18. 2.) Determine the formula with the remaining variables.
3.) Multiply across in the wheel, Divide up and down in the wheel
SHOW ALL OF YOUR WORK!

19. m : : d v x

20. Common Conversion Factors
Used to convert between related measurements
Some are common to you, some are new or often forgotten
These conversions will be used in dimensional analysis to convert between units
Ex: 1” = 2.54 cm

21. QUESTIONS?