Units & Measurement. Things we measure…. Derived Units. Old English System Units…. Modern Units….
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Units & Measurement
Things we measure…
Old English System Units…
Big Mac Index - a measure of exchange rates betweentwo currencies. It was defined by Economist's editor Pam Woodall to measure whether a currency is under or overvalued. She used a Big Mac because the burger is produced in about 120 countries.
A "Kardashian" is a unit of measure representing 72 days of marriage. This unit of time came in response to the 72 day marriage of Kim Kardashian to Kris Humphries.
Twitter followers: Wheaton
The Wheaton is a measurement of Twitter followers relative to celebrity Wil Wheaton. The measurement was standardized when Wil Wheaton achieved half a million Twitter followers, with the effect that Wil Wheaton now has 4 Wheatons himself. As few Twitter users have millions of followers, the milliwheaton (500 followers) is more commonly used.
Why have Standards?
Order of Magnitude -
Dimensional Analysis -
How many seconds are in a year?
An electron in a conducting wire can travel at speeds of 5,652,000km/hr…
Convert this speed to m/s and then into scientific notation.
Why doesn’t the electron flow
in straight line like a water molecule in a pipe?
2.5 x 108
5.0 x 10-3m
2.39 x 105
1.5 x 10-9