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### 46 Cards in this Set

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 unit fixed standard of measurement precision closeness of set of values obtained from identical measurements of a quantity accuracy closeness of a single measurement to its true value significant figures those digits in a measured number that include all certain digits plus one final one having some uncertainty number of sig figs number of digits reported for the value of a measured or calculated quantity; indicating precision of the value 4 rules of sig fig 1. zeros at beg (left of decimal) aren't sig 2. Terminal zeros (right of decimal) are dig 3. Terminal zeros (left of decimal might be sig Scientific Notation Representation of number in form A x 10^n 2 rules of sig fig calculation 1. Multiply and divide - answer will have least number of sig figs 2. add subtract -- answer will have least number of decimal places exact number number that arises when you count items or when you define a unit rounding procedure of dropping nonsig digits in a calculation and adjusting the last digit reported Rounding rules 1. If digit is 5 or greater drop it and all other to right and add 1 to last digit 2. If digit is less than 5 drop it all digits past it SI Base Units length meter m mass kilogram kg time second s temperature kelvin K amount of substance mole mol electric current ampere A Luminous intensity candela cd 10^18 exa E 10^15 peta P 10^12 tera T 10^9 giga G 10^6 mega M 10^3 kilo k 10^2 hecto h 10 deka da 10^-1 deci d 10^-2 centi c 10^-3 milli m 10^-6 micro u -mu 10^-9 nano n 10^-12 pico p 10^-15 femto f 10^-18 atto a Formula to convert K and degrees C Kelvin equals celcius times 1K over IC and then add 273.15K Formula to convert C to F celcius equals 5 deg C over 9 deg F times the result of temp in F minus 32 deg F SI derived unit unit dervived by combining base units area length squared m^2 volume length cubed m^3 density mass per unit volume kg/m^3 speed distance traveled per unit of time m/s acceleration speed changed per unit of time m/s^2 force mass times acceleration of object kg x m/s^2 (=newton, N) pressure force per unit area kg/(m * s^2) (=pascal, Pa) Energy force times distance traveled kg * m^2/s^2 (=joule, J) density d=m/V