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# Tools of Science

### Mrs. P's Chapter 2

TermDefinition
metric system a system of measurement based on the number 10
International System of Units(SI) a system of measurement based on multiples of ten and on established measures of mass, length, and time
mass a measure of how much matter is in an object
weight a measure of the force if gravity acting on an object
density measurement of how much mass of a substance is contained in a given volume
volume the amount of space that matter occupies
estimate an approximation of a number based on reasonable assumptions
accuracy how close a measurement is to the true or accepted value
precision how close a group of measurements are to each other
percent error a calculation used to determine how accurate or close to the true value an experimental value really is
mean the numerical average of a set of data
median the middle number in a set of data
mode the number that appears most often in a list of numbers
range the difference between the greatest value and the lease value in a set of data
anomalous data data that do not fit with the rest of the data
graph a picture of information from a data table; shows the relationship between variables
linear graph a line graph in which the data points yield a straight line
non-linear graph a line graph in which the data points do not fall along a straight line
Created by: jprevost5