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the realm of atoms and molecules, where objects are smaller than can be detected by optical microscopes
is a testable assumption, or guess, often used to explain an observed phonomenon
an explanation using an integrated set of principles that organizes and predicts observations.
a measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object
The coldest temperature, 0 Kelvin, that can be reached. It is the hypothetical temperature at which all molecular motion stops.
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