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Measurements Length Size of an
object. English: Foot
(ft) SI: Meter (m)
Measurements Mass Amount of
matter an object contains.
English: Pounds (lb)
SI: Grams (g)
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373.35 g
Measurements Temperature Measures the
kinetic energy of molecules.
English: Fahrenheit (°F)
SI: Celsius (°C)
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Measurements Volume The amount of
space an object occupies.
English: Gallon (gal)
SI: Liter (L)
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Measurements Volume is considered a
derived unit since it can be calculated using length measurements
Volume = l x w x h V = 5m x 3m x 3m V = 45 m3
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Unit Conversions The main
units can be scaled up or down using prefixes on page 15.
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Unit Conversions
Kilo- is 1000 times larger than base.
Centi- is 100 times smaller than base.
Milli- is 1000 times smaller than base.
Unit Conversions
Example: How many millimeters (mm) are there in 2 meters (m)?
2 m 1000 mm
1 m= 2000 mm
Dimensional Analysis…or “Bridge Problems”
Conversion Factor is equal
to one!
Unit Conversions
Example: How many centimeters are there in 2.5 kilometers?
2.5 km 1000 m
1 km= 250000
cm1 m
100 cm
Convert to “Base” Unit 1st!
Unit Conversions
Example: How many kilograms (kg) are there in 100 grams (g)?
100 g 1 kg
1000 g= 0.1 kg