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Metric Units (SI Units). Measurements. Must have a number and a unit (Ex) 13 vs. 13 cm The number tells how much you have The unit tells what you are measuring (Ex) cm = length; g = mass; L = volume; J = energy; °C = temperature.

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Metric units si units

Metric Units(SI Units)


Measurements
Measurements

  • Must have a number and a unit

    (Ex) 13 vs. 13 cm

    • The number tells how much you have

    • The unit tells what you are measuring

      (Ex) cm = length; g = mass; L = volume; J = energy;

      °C = temperature


Si units metric units international system of units
SI Units (≈metric units)(International System of Units)

  • Notice the basic units have one letter.

  • * All other units are derived units and have two letters or more.



How to use prefixes
How to Use Prefixes

1 kg = 1000 g

1 cm = 0.01 m

1 mL = 0.001 L

1 Ms = 1000000 s

1 µL = 0.000001 L


Math Review

(1)

(Ex)

(2)


Unit conversion
Unit Conversion

  • Conversion factors (CF)

    1. always in fraction form

    2. always equal to 1

    (Ex)

    3. More than 1 CF can be multiplied

    4. Units are treated like variables

    (Ex)


Converting units
Converting Units

(Ex) Convert 1.74 m to cm

(Ex) Convert 14.5 nm to mm.


Practices
Practices

Convert the units

1) 592 cmto in

2) 8.5 L/min to gal/sec

3) 65 km/hr to mile/min


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