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Newton coined the term “spectrum” to describe this collection of different‑colored lights.
Chemistry can be defined as the study of matter. But because everything in the universe is made up of matter and matter can be converted into energy, this oversimplified definition would basically mean that chemistry is the study of everything.
Accuracy refers to the average value of a data set—how close it is to the actual value. Precision refers to how tightly grouped the individual data points are. Precision refers specifically to how reproducible individual readings are.
We call the Kelvin scale an absolute temperature scale, because 0 Kelvins means no molecular motion, and you can’t move slower than that. Kelvins are an indispensable unit of temperature in chemistry.