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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