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Measurements Chapter 3 Kamoryn Heilig's Coggle Map (Measurement (Error…
Measurements Chapter 3 Kamoryn Heilig's Coggle Map
Measurement
Accuracy
how close it comes to the actual target/number
Precision
how close a series of measurements are to one another
Definition
a quantity that has both a number and a unit :
Illustration
Accuracy v. Precision
Scientific Notation
Short hand way of writing very large or small numbers
Examples
6.02 x 10^23
Positive Exponent = big number
1.98 x 10^21
Negative Exponent = small number
Error
Accepted Value
Value measured many times for a constant value.
Experimental Value
Measured in a lab.
Error = Experimental Value = Accepted Value
Percent Error = ([error] \ accepted value) x 100%
International System of Units (the SI System)
Updated version of the metric system
Based on multiples of
10
, making conversions very easy to figure out
Uses Prefixes and Units
Common Prefixes
Kilo (K) - 1,000 base units
Hecto (H) - 100 base units
Deka (D) - 10 base units
Base UNIT - 1 base unit
deci (d) - 1/10th base unit
centi (c) - 1/100th base unit
milli (m) - 1/1000th base unit
Common Base Units
Amps
Liter
Meter
Gram
Kelvin
Second
Mole
Joule
Significant Figures