
Platte Canyon High
School 

USEFUL INFORMATION 

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History:
The metric system is the international decimal system of weights and measures based on the meter and the kilogram. The essentials of the system were embodied in a report made to the French national assembly by the Paris Academy of Sciences in 1791. Although modifications have been made since that time, primarily in regards to the precision of the basic units, the overall metric system remains unchanged. The term "metric" comes from the French metron (to measure).
Definitions of base units:
Length meter or metre
m
Old: 1/10,000,000^{th} the distance from the North Pole to the Equator New: 1,650,763.73 wavelengths in vacuum of radiation corresponding to the transition between the 2p^{10 }and^{ }5d^{5} in the krypton 86 atom
Mass kilogram or kilogramme
kg
The mass of 1 liter of pure water at 4 degrees Celsius Temperature degree Celsius or
Kelvin
° C
or
K
1/100^{th} the difference between the melting point temperature and the boiling point temperature of water. Note: this is often replaced by Kelvin which has the same size degree but a zero starting point 273 degrees lower than Celsius (i.e., 0 degrees Celsius = 273 Kelvin). The term degree is also not used when using Kelvin. Time second
s
Old: 1/86400^{th} of a mean solar day New: duration of 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the groundstate of the atom of cesium 133.
Electric Current ampere
A
that constant current, which, if maintained in two straight parallel conductors of infinite length, of negligible circular crosssection and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 x 10^{7} Newton per meter of length Luminous intensity candela cd
in a perpendicular direction, of a surface of 1/600000 square meter of a black body at the temperature of freezing platinum under a pressure of 101325 Newtons per square meter Amount of substance mole mol
amount of substance of a system, which contains as many elementary entities as there are atoms in 0.012 kg of C12.
Metric Prefixes
yotta Y
1,000,000,000,000,000,000,000,000
10^{24} septillion zetta Z
1,000,000,000,000,000,000,000
10^{21} sextillion exa E
1,000,000,000,000,000,000
10^{18} quintillion peta P
1,000,000,000,000,000
10^{15} quadrillion tera T
1,000,000,000,000
10^{12} trillion giga G
1,000,000,000
10^{9} billion mega M
1,000,000
10^{6} million kilo k
1,000
10^{3} thousand hecto h
100
10^{2} hundred deka da
10
10^{1} ten 1
10^{0} one deci d
0.1
10^{1} tenth centi c
0.01
10^{2} hundredth milli m
0.001
10^{3} thousandth micro m
0.000001
10^{6} millionth nano n
0.000000001
10^{9} billionth pico p
0.000000000001
10^{12} trillionth femto f
0.000000000000001
10^{15} quadrillionth atto a
0.000000000000000001
10^{18} quintillionth zepto z
0.000000000000000000001
10^{21} sextillionth yocto y
0.000000000000000000000001
10^{24} septillionth mks System that uses meters, kilograms, and seconds (we will be using this one)
cgs System that uses centimeters, grams, and seconds
SI Systeme Internationale  the metric system
Useful Conversions:
Although we will not be using the English measurement system in this class, here are a few useful conversions to know:
1 inch = 2.54 cm
1 kg = 2.2 lbs
1 mile = 1.61 km
1 km = 0.62 miles
°F = 9/5(° C) + 32 ^{}
°C = 5/9(° F32)
1 L = 1.06 qts
1fl. oz = 29.6 cm^{3}
1 oz = 28.35 g
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