Standards of Measurement

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# Standards of Measurement - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Standards of Measurement' - apria

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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)

B. Metric system (meter, centimeter)

International System of Units (SI)

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

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

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

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

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