METRIC SYSTEM Length MEASUREMENT Basic to all science

METRIC SYSTEM Length

MEASUREMENT • Basic to all science • Measure is when you compare an object to some standard quantity. • Standard is called The International System of Units. (SI units) • SI units are based on powers of 10.

LENGTH • Definition: the distance between two points • SI unit of length: Meter (m) • Sub Units are: • Millimeter (mm) • Centimeter (cm) • Kilometer (Km) • Tool of Measurement is Meter Stick or Metric Ruler

COMMON CONVERSIONS IN LENGTH • 1 m = 1000 mm (very small unit) • 1 m = 100 cm (small unit) • 1000 m = 1 km (large unit)

QUESTION? ? ? • 1. If you were measuring the distance between Lone Star and West Middle Schools, what length subunit would your probably use? (mm, cm or km) • Answer: Kilometer (km) for a large length measurement.

QUESTION? ? • 1. If you were measuring the length of your pencil, what measurement subunit would you probably report your answer in (cm, mm or km) • Answer: probably centimeter (cm) for a small unit, but you could report in a very small unit millimeter (mm) too.

PRACTICE USING A METRIC RULER • 1. Measure your Pen or Pencil to: • A) Nearest centimenter (cm) • B) Nearest millimenter (mm) • 2. Measure the length and width of an index card in centimeters (cm) length height l Index Card

LENGTH LAB • In your notebook, title the Item next blank page “Length Lab” • Find 10 items around the room that you can measure to the nearest centimeter, tenth of a centimeter, and millimeter Nearest cm Nearest 0. 1 cm Nearest mm