# Measurments and Calculations

 Hypothesis
 a testable statement
 Scientific method
 a logical apporach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses, and fromulating 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 broad generalization that explains a body of facts or phenomena
 Model
 an explanation of how phenomena occur and how data or events are related
 Conversion factor
 a ratio derivied from equality between two different units that can be used to convert from one unit to the other
 Density
 the ratio of mass to volume or mass  divided by volme
 SI ( Le Systeme Iternational d’ unites)
 the measurement system accepted worldwide
 Volume
 the amount of space occupied by an object
 Weight
 a measure of the gravitational pull on matter
 Quanity
 something that has magnitude, size, or amount
 Derivied unit
 a unit that is a combination of SI base units
 Accuracy
 the closeness of measurements to the correct or accepted value of the quanity measured
 Direct porportion
 two quantities that give a constant value when ine is divided by the other
 inverse proportion
 two quantities thathave a constant mathematical product
 Percent error
 a value calculated by subtracting the experimental value from the accepted value, dividing the difference by the accepted value and then multiplying by 100
 Precision
 the closeness of a set of measurmets of the same quanity made in the same way
 Significant figure
 any digit in a measurement thst is known with certanity plus one final digit, which is somewhat uncertain or is estimated
 Scientific method
 a logcal appoach to sloving problems by observing and colleting data, formulating hypotheses, testing, hypotheses, and formulating theories that are supported by data
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