1. A. Number vs. Quantity
Quantity - number + unit
UNITS MATTER!!

2. Celcius* (centigrade*)
Metrics – Base Units
Measurement
Base Unit
Abbreviation
Length
meter m
Mass
gram* g
Volume
liter L
Temperature
Celcius* (centigrade*) or
Kelvin oC K
*These are not SI units, but are base units for these measurements.

3. Base units continued
Amount of Substance
mole
mol
Time
seconds s

4. A. SI Prefix Conversions
Symbol
Factor
mega- M
106
Base Units
Gram (g)
Liter (L)
Meter (m)
seconds(s)
kilo- k
103
BASE UNIT
---
100
deci- d
10-1
move left
move right
centi- c
10-2
milli- m
10-3
micro- 
10-6
nano- n
10-9
pico- p
10-12

5. Why use the metric system?

6. Metrics
Because of the worldwide use of science, an international system of measurements was developed in 1960.
This system is referred to as the SI (le Systeme International).
This system utilizes specific SI base units.
The advantage of the system is that it is a decimal system based on multiples of 10.
The system uses prefixes to indicate the multiples of 10. (How many times you move the decimal.)

7. A. SI Prefix Conversions=
532 m = _______ km
0.532
NUMBER
UNIT
NUMBER
UNIT

8. A. SI Prefix Conversions
1. Find the difference between the exponents of the two prefixes. 2. Move the decimal that many places.
To the left
or right?

9. (exponent of start)-(exponent of end)
33 kg to mg
Kilo has an exponent of 3 and milli has an exponent of -3
(3) – (-3) = 6 since it is positive, you move it places to the right
24 mm to m
Milli has an exponent of -3 and meter is a base unit so it has an exponent of 0
(-3) – (0) = -3 since it is negative you move 3 places to the left

10. A. SI Prefix Conversions
1) 20 cm = ______________ m 2) L = ______________ mL 3) 45 m = ______________ nm 4) 805 dm = ______________ km

11. Temperature Scales
Fahrenheit: Based upon the boiling and melting points of alcohol.
Celsius: Based upon the boiling and melting points of water.
0o C = Melting Point
100o C = Boiling Point
11/18/2018

12. Compare Temperatures
F = C (1.8) + 32
C = F – 32 (.555)
11/18/2018

13. Absolute Temperature Kelvin: Based scale upon absolute zero.
Absolute Zero: The coldest temperature possible. (Theoretical Point)
Remember that temperature is based on average KE. Therefore, at 0 Kelvin there will be absolutely no movement of the atoms/molecules of the substance.
Absolute Zero = C
Used the same sized graduations as in the Celsius scale.
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14. Kevin to Celsius Comparisons
Melting Point
Absolute Zero
0 C C K
0 K
Kelvin degrees are the same graduation as Celsius
They simply start (0) at different places.
Celsius at Melting Point, Kelvin at Absolute Zero
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15. Kelvin/Celsius Conversions
Melting Point
Absolute Zero
0 C C K
0 K
K = C + 273*
C = K – 273*
*A more precise value would be , but to keep it simple, we’ll use the 273 value.
11/18/2018