1. Unit Conversion Bellwork
6 feet = 1.83 meters
5 gallons = 18,900 mL
120 lbs = 54,545.5 g
75 mins = days
2.3 miles = 3,701.5 meters
2,264.7 in = 57.5 meters

2. Measurement
WCHS Chemistry

3. Measurement A comparison to a standard Ex: foot
How were horses once measured?
Hands

4. S.I. Units (System International)
A universally accepted standard for all math and science measurements
L = liter
measures volume
g = gram
measures mass
C = celsius
Measures temperature
m = Meter
Measures length or distance

5. S.I Unit Conversions k. H. D. b. d. c. m.
Kilo hecto deka m,L,g deci centi milli
Move the decimal the desired number of places!
King Henry drank bottles of delicious chocolate milk

6. 50 cm ________________ km
Practice k H D b d c m
50 cm ________________ km
15 L = _________________ mL

7. Measured Values vs. Counted Values
IMPORTANT!!!
All measured values contain some degree of error!
Counted values DO NOT contain any error
Ex: if you count 5 sheep, you have exactly 5

8. Degree of Error Ex: Balance, stopwatch, graduated cylinder, ruler
All measure, so all have error!
As some point you have to guess or round

9. At Some Point You have to Guess...
When?
Estimate to 1/10th the smallest place of the device (THE NEXT SPOT YOU CAN’T SEE)
The limits of the instrument tell you how to round
Ex: someone ran the 100m dash in sec? NO!
Why or why not?
You’re limited by your device

10. Precision in Measurement
Area equation = l x w
Calculation #1
Calculation #2
Calculation #3
Area equation = ½ b x H
Calculation #1
Calculation #2
Calculation #3