Mass: Amount of matter in an object.

Matter: Anything that has mass and occupies space.

Weight: Force of gravity on an object's mass.

Scientific Method: Systematic research approach.

Qualitative Data: Descriptive, non-numerical information.

Quantitative Data: Numerical information.

Hypothesis: Testable prediction or explanation.

Experiment: Controlled procedure to test a hypothesis.

Independent Variable: Factor changed by the experimenter.

Dependent Variable: Factor measured in response to changes.

Control: Standard for comparison in an experiment.

Conclusion: Summary of experimental results.

Model: Representation of an idea, object, or system.

Theory: Well-substantiated explanation of natural phenomena.

Scientific Law: Statement describing consistent natural phenomena.

Pure Research: Study for knowledge's sake.

Applied Research: Study to solve practical problems.

Technology: Application of scientific knowledge.

Chemistry: Study of matter and its interactions.