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| scientific method | an organized set of investigative procedures that can include stating a problem, forming a hypothesis, researching and gathering information, testing the hypothesis, analyzing data, and drawing conclusions |
| hypothesis | educated guess using what you know and observe |
| experiment | organized procedure for testing a hypothesis; tests the effect of one thing on another using controlled conditions |
| variable | a factor that can cause a change in the results of an experiment |
| dependent variable | factor that changes as a result of changes in the other variables |
| independent variable | factor that , as it changes, affects the measure of another variable |
| constant | in an experiment , a variable that does not change when other variables change |
| control | standard used for comparison of test results in an experiment |
| bias | occurs when a scientist's expectations change how the results of an experiment are viewed |
| model | can be used to represent an idea, object, or event that is too big, too small, too complex, or too dangerous to observe or test directly |
| theory | explanation of things or events that is based on knowledge gained from many observations and investigations |
| scientific law | statement about what happens in nature and that seems to be true all the time; does not explain why or how something happens |
| technology | application of science to help people |
| standard | exact, agreed-upon quantity used for comparison |
| SI | International System of Units the improved, universally accepted version of the metric system that is based on multiples of ten and includes the meter (m), liter (l), and kilogram (kg) |
| volume | amount of space occupied by an object |
| mass | amount of matter in an object |
| density | mass per unit of volume of a material |
| graph | visual display of information or data that can provide a quick way to communicate a lot of information and allow scientists to observe a pattern |
