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Le system international d’unites (SI)
a international system of measurements
Base Unit
a defined unit in a system of measurement that is based on an object or event.
time
seconds (s)
length
meter (m)
mass
Kilogram (kg)
temperature
kelvin (k)
amount of substance
mole (mol)
electric current
ampere (A)
Luminous intensity
candela (cd)
kilo
(k) 1000 - 103
centi
( c) 1/100 - 10-2
milli
(m) 1/1000 - 10-3
SI base unit of temperature
Kelvin (K)
derived unit
unit that is defined by a combination of base units
density equation
mass/volume
scientific notation
used to express any number between 1 and 9, multiplied by 10 and raised to a power
dimensional analysis
a systematic approach to problem solving that uses conversion factors to move, or convert, from one unit to another
conversion factor
ratio of equivalent value having different units
error
defined as the difference between the experimental value and accepted value
error equation
error = experimental - accepted value
percent error
expresses as a percentage of the accepted value
percent error equation
percent error = error/accepted value x 100
significant figures
all known digits plus one estimated digits
interpolation
reading and estimating values falling between points on the graph
extrapolation
estimating values outside the points by extending the line
