Properties and Changes of Matter
Everything around you is matter, and every piece of matter can be described and can change. Learning to describe matter by its properties, and to tell a physical change from a chemical one, is one of the most testable skills in all of science. It also explains everyday things, like why ice melting is reversible […]
Measurement, Instruments, and Safety
Science runs on measurement. Before anyone can compare results or repeat an experiment, they need to agree on what the numbers mean, and that is why scientists worldwide use the same system of units and the same handful of instruments. Getting comfortable with them removes a whole category of easy test mistakes. This lesson covers […]
