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Control the standard that you compare to in an experiment Density the amount of mass in a unit of volume Constant a measurement in an experiment that never changes Experiment a controlled test Dependent variable the variable in an experiment that changes because of the independent variable, goes on the y-axis Model something that stands for an idea, event, or object that makes it easier to understand Bias a scientist using their own opinion to change the results of an experiment Hypothesis an educated guess about the results of an experiment Independent variable the variable in an experiment that the scientist changes, goes on the x-axis Graph a visual tool to represent data Theory a system of ideas backed by scientific data that explains something Scientific method a method of procedure that scientists use to perform an experiment Volume a measurement of how much space is taken up by an object Quantitative observation an observation involving numbers SI a standard of measurements used by scientists that is based on the powers of 10 Standard an exact quantity to compare measurements Inference a conclusion based on scientific evidence Quantitative observation an observation involving words Scientific law an explanation of nature that all scientists agree with