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Measurement
Determination of amount of something
Number value and a unit
Unit –
standard amount that
everyone agrees with
ENGLISH SYSTEM
United StatesCommon measurements
Miles, yards, feet, inches, pounds, pints, quarts, gallons, cups, teaspoon
Only 2-3 Countries use this
(its an old system)
International System of Units
”SI”Metric system
created in 1800’s in FranceRelates all units to form a base of 10
1960 named SI
U.S. is the only industrialized nation
not to adopt the SI
UNCERTAINTY
All physical measurements are to some extent uncertain.
The degree of percision is indicated by
SIGNIFICANT FIGURES
KILO1000Units
HECTO100
Units
DEKA10
UnitsDECI
0.1Unit
CENTI0.01Unit
MILLI0.001Unit
MetersLitersGrams
Ladder Method
How do you use the “ladder” method?
1st – Determine your starting point.
2nd – Count the “jumps” to your ending point.
3rd – Move the decimal the same number of jumps in the same direction.
4 km = _________ m
12
3
How many jumps does it take?
Starting Point Ending Point
4.1
__.2
__.3
__.= 4000 m
UNCERTAINTY
All physical measurements are to some extent uncertain.
The degree of precision is indicated by
SIGNIFICANT FIGURES
Write the correct abbreviation for each metric unit.
1) Kilogram _____ 4) Milliliter _____ 7) Kilometer _____
2) Meter _____ 5) Millimeter _____ 8) Centimeter _____
3) Gram _____ 6) Liter _____ 9) Milligram _____
Problems: 1)How many milliliters are in a liter?
2) How many centimeters are in a meter? 3) How many kilometers are in a meter?
4) How many centimeters are in a kilometer?
5) How many kilometers are in a centimeter?
Metric Conversion Challenge
Try these conversions, using the ladder method.
1) 1000 mg = _______ g 6) 1 L = _______ mL 11) 160 cm = _______ mm
2) 14 km = _______ m 7) 109 g = _______ kg 12) 250 m = _______ km
SI - length
Meters 1 kilometer (km) = 1,000 meters (103) 1 hectometer (hm) = 100 meters (102) 1 decameter (da) = 10 meters (101) 1 meter 10 decimeters (dm) = 1 meter (10-1) 100 centimeters (cm) = 1 meter (10-2) 1,000 millimeters (mm) = 1 meter (10-3)
SI - Mass
Grams 1 kilogram (kg) = 1,000 grams (103) 1 hectogram (hg) = 100 grams (102) 1 decagram (dag) = 10 grams (101) 1 gram 10 decigram (dg) = 1 gram (10-1) 100 centigram (cg) = 1 gram (10-2) 1,000 milligram (mg) = 1 gram (10-3)
(usually in kg)
SI - Volume
Liters 1 kiloLiter (kL) = 1,000 liters (103) 1 hectoLiter (hL) = 100 liters (102) 1 decaLiter (daL) = 10 liters (101) 1 Liter 10 deciLiter (dL) = 1 liters (10-1) 100 centiLiter (cL) = 1 liters (10-2) 1,000 milliLiter (mL) = 1 liters (10-3)