SI System prefixes:
-We can put a prefix in front of a unit and change the power of the unit.
-The SI System uses many prefixes to represent very large or very small numbers
-A common mistake is to uses scientific notation and prefixes together, they will becomes very confusing (Ex. 2.5x 10^7nm)
Experimental Accuracy:
-In general the maximum accuracy of any measurements is ½ of the smallest division of the measuring device.
-A ruler with measurement of millimeters has a maximum accuracy of (-, + 0.5mm)
Examples:
A gradulated cylinder has unitsa of 1.0ml. The Accuracy of the cylinder is 0.5ml. The liquid in a gradulated cylinder will typically form a curved top called a "Meniscus". The volume is taken at the bottom of the Meniscus. Sometime the Meniscus will curve upward, if so then just measure the peak of the Meniscus.
Expressing Error:
-Error is a fundamental part of science. There are usually 3 reasons for an error:
1) Physical error in the measuring device
2) Sloppy Measuring
3) Changing ambient conditions
Calculated Error:
-2 different types of error:
1) Absolute Error
2) Percentage Error
(Absolute Error = Measured - Accepted)
Percent Error:
-It is the most common. An equation would look like:
(Percent Error = Absolute Error / Accepted Value)
or
% Error = {Measured - Accepted / Accepted} x 100
Good work thus far. Your background is really interesting ;) The posts are fairly thorough and for the most part include everything important. I'm also impressed with the detailed pictures you've included. In the future it might also be helpful to check and see what sort of videos you can find in youtube. They are pretty easy to embed in the blog and will add a lot to the information content if properly selected.
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