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### 30 Cards in this Set

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 quantity something that has magnitude, size, or amount SI scientists all over the world have agreed on a single measurement system called... SI unit Length unit name meters (m) SI unit Mass kilogram (kg) SI untit time second (s) SI untit temp. kelvin (K) SI unit amnt. of substance mole (mol) weight measure of the gravitational pull on matter. NOT THE SAME AS MASS! tera(T) 10^12 giga(G) 10^9 mega(M) 10^6 kilo(k) 10^3 hecto(h) 10^2 deka(da) 10^1 deci(d) 10^-1 centi(c) 10^-2 milli(m) 10^-3 micro(fancy m) 10^-6 nano(n) 10^-9 derived units combinations of SI units, multiplied or divided by standard units volume(m^3) Amnt. of space occupied by an object Density= Mass/Volume Conversion factor ratio derived from the equality between two different units that can be used to convert one unit to the other. Accuracy refers to the closeness of measurements to the correct or accepted value of the quantity measured Percision close to one another but not necessarily close to the accepted value percent error= ((value accepted-value experimental)/(value accepted))x100 Significant figures in a measurement consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated Scientific Notation numbers are written in the form Mx10^n, where the factor M is a number greater than or equal to 1 but less than 10 and n is a whole number Directly proportional if dividing one by the other gives a constant value. y/x=k Inversely proportional their product is constant xy=k