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Standards of Measurement. Standard – exact quantity that people agree to use to compare measurements. 2. Each measurement must include a. Number b. Unit Ex: 5 centimeters 1 gallon. 3. Two common systems of measurement: A. English System (foot, inches)

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slide2

Standard – exact quantity that people

agree to use to compare measurements.

2. Each measurement must include

a. Number

b. Unit

Ex: 5 centimeters

1 gallon

slide3

3. Two common systems of measurement:

A. English System (foot, inches)

B. Metric system (meter, centimeter)

slide4

International System of Units (SI)

  • Abbreviated SI
  • Developed in 1960
  • Le SystemeInternationaled’Unites(French)
  • Universally accepted and understood by scientists throughout the world
slide6

5. In the US, the National Institute of Standards maintains standards and sets style conventions.

Ex. 75 000 vs 75,000

http://www.nist.gov/index.html

slide17

original meter = 1/10,000,000 of the

distance from the North Pole to the

equator but was off 0.2millimeter due to miscalculation of flattening of earth from

today a meter = distance light travels

in 1/299,792,458 of a second

slide18

Metric System

Base 10 – scaled on multiples of 10

A) MULTIPLY by 10 – move decimal to the RIGHT

a) 7.23 x 10 = 72.3

b) 9,786 x 100 = 978,600

c) 0.0045 x 1000 = 4.5

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B) DIVIDE by 10 – move decimal to the LEFT

a) 6.0/10 = 0.6

b) 9,786 / 100 = 9.786

c) 0.45 / 1000 = 0.00045