Measurement SI fundamental units Mass;Length;Time; Temperature; Amount SI Prefixes Tera (T) Giga (G) Mega (M) Kilo (K)(k) - ppt download

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Measurement Because each measurement has uncertainty there is a limit to the precision with which we can determine an answer. This precision is determined using sig figs. What is significant?  All nonzero integers  Trailing zeros followed by a decimal ex: 200. = 3 sf  Zero to the right of a decimal, with a number in front ex: = 3 What is not?  Leading zeros and zeros to the right of a decimal with no nonzero number in front ex: = ? Sf  Trailing zeros not followed by a decimal ex: 200 = 1 sf For multiplication and division, use least # of digits For addition and subtraction, answer should match # with least precision
Measurement SI fundamental units Mass;Length;Time; Temperature; Amount SI Prefixes Tera (T) Giga (G) Mega (M) Kilo (K)(k) Base unit deci (d) centi (c) milli (m) micro (μ) nano (n) pico (p) femto (f) atto (a)
- Precision may also refer to how fine a particular instrument will measure. The finer an instrument, the more likely a group of measurements will be closer together. eg. graduated cylinder vs. beaker.  Uncertainty - Each instrument has a limit to its precision. Measurements are typically reported to 1/10 th of the smallest division for instruments with markings. The last digit is estimated and the uncertainty of the measurement is given as + 0.5x the reported precision. For electronics the uncertainty is + the last displayed digit..
This precision is determined using sig figs. What is significant.  All nonzero integers  Trailing zeros followed by a decimal ex: 200. = 3 sf  Zero to the right of a decimal, with a number in front ex: = 3 What is not.  Leading zeros and zeros to the right of a decimal with no nonzero number in front ex: = . Sf  Trailing zeros not followed by a decimal ex: 200 = 1 sf For multiplication and division, use least # of digits For addition and subtraction, answer should match # with least precision.
experimenter) is involved..
Determine the mean b. Determine the absolute difference between each value and the mean c. Add the differences together d. Divide by the total number of measurements e. Express answer as: mean + average deviation Percent average deviation  Divide the average deviation by the mean; x 100 Express answer as: mean + % deviation Percent (average) deviation is expressed to only 1sig fig n.b. Calculated values for mean match the precision of the measurements used!.
– The precision for the mean and the deviation should match (except for % deviation). _ Be sure to express the standard deviation as a function of the mean..
The following values were reported (in cm.): ..00193;.00220;.00189;.00216;.00278;.00226; EExpress the mean value for the thickness of Zn including Average deviation % deviation Standard deviation / cm cm +/- 9% / cm.
WWorks by multiplying with conversion factors Example: A pancake – eating contest was won by an individual who ate 74 pancakes in 6.0 minutes. At that pace, how many eggs would he have eaten in 1.00 hour. Assume 1 egg was used to make 8 pancakes. Light travels at 186,000 mi/s. How many centimeters would light travel in one year. Assume da/yr and 1 mi = km..