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Units of MeasureSection 1.2 Metric Length
Pre-View 1.2
• Meter – the standard SI unit for measuring length.
• Ruler or meter stick – tool used to measure length in centimeters or millimeters
• The smallest marks on a ruler or meter stick indicate millimeters (mm).
• There are 1000 mm in one meter.• The longer marks on a ruler or meter stick
show centimeters (cm) – 10 mm = 1 cm, and there are 100 cm in one meter.
• Longer lengths are measured in kilometers (km), which are 1000 meters.
10 mmor
1 cm
SI unit of Length: Kilometer (km)
• When to use it…–Use kilometers for long distances.
• Example:–The distance from Birmingham to
Anniston is about 106 km
SI unit of Length: Meter (m)
• When to use it…–Use meters instead of feet or yards.
• Example:–The height of an average room from
floor to ceiling is about 3 m
SI unit of Length: Centimeter (cm)
• When to use it…–Use centimeters instead of inches.
• Example:–One inch is 2.54 cm. The width of
notebook paper is about 21.6 cm
SI unit of Length: Millimeter (mm)
• When to use it…–Use millimeters for small but visible
lengths.
• Example:–The diameter of an average pencil is
7 mm
SI unit of Length: Micrometer (μm)
• When to use it…–Use micrometers to measure very small
or microscopic dimensions.
• Example:–The length of a paramecium is about
50 μm