SI System is set-up so it is easy to move from one unit to another.
Units that arise from other SI units are called derived units.
Volume Volume is the amount of space occupied by an object. The derived SI unit is cubic meters, m 3 The cubic centimeter, cm 3, is often used The liter, L, is a non-SI unit 1 L = 1000 cm 3 1 mL = 1 cm 3
Rules for Counting Significant Figures Nonzero integers always count as significant figures. 3456 4 sig figs Significant Figures Consist of all digits that are known with certainty plus one final digit which is uncertain or estimated.
Rules for Counting Significant Figures - Zeros Leading zeros do not count as significant figures. 0.0486 3 sig figs.
Captive zeros always count as significant figures. 16.07 4 sig figs Rules for Counting Significant Figures - Zeros
Trailing zeros are significant only if the number contains a decimal point. 9.300 4 sig figs Rules for Counting Significant Figures - Zeros
Rules for Significant Figures in Mathematical Operations Multiplication and Division: # sig figs in the result has the same number of significant figures as the number with the fewest significant figures. 6.38 2.0 = 12.76 Rounds to 13 (2 sig figs)
Rules for Significant Figures in Mathematical Operations Addition and Subtraction: the result has the same number of decimal places as the least precise measurement. 6.8 + 15.6896 = 22.4896 Rounds to 22.5 (3 sig figs)
is calculated by subtracting the accepted value from the experimental value, dividing the difference by the accepted value, and then multiplying by 100. Percent Error
Direct Proportions Two quantities are in direct proportion if dividing one by the other gives a constant value. Indirect Proportions Two quantities are inversely proportional if their product is constant.