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### 19 Cards in this Set

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 hypothesis a testable statment model an explanation of how phenomena occurs and how data or events are reslated sceientirfic method a logical approach to solving problems by observing and collecting data, forumalating hypothesis, testing it , and formulating theories that are supported by data system a specific portion of matter in a given region of space that has been selected for study during an experiment or observation theory a braod generalization that explainsa body of facts or phenomena conversion factor a ration derived from the equality between 2 different untis that can be used to convert form one unit to another density the ration of mass to volume or mass divided by ovolume derived unit a unit that is a comhination of SI base untis quanitity something that has magnitude, size or amount SI the measurement system measured worldwide volume the amount of space occupied by an object weight a measure of the gravitaional pull on matter accuracy the closeness of measuremetns to the correct value when one is divided by the other indirectly proportional two quanitites have the same mathematical product directly proportional two quanitites that give a constant value when one is divided by the other percent error a value calculated by subtracting the experimental value from the accepted value, divideing the difference bt the accepted value and then multiplying by 100 precision the closeness of a set of measurements of the same quantity made in the same way scientific notation numbers written in the form MX10^n where the factor M is a number greater than or equal to one but less than ten and n is a whole number significant figures any digit in a measurement that is known with certainty plus one final digit, which is somewhat uncertain or is estimated