Theory
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A scientific theory is a well-substantiated explanation of a natural phenomenon, built from confirmed hypotheses and tested repeatedly against observations.
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Atomic theory explains countless observations, from fixed reaction ratios to gas behavior, under one framework, surviving a century of tests.
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In speech "theory" means a guess; in chemistry it means an explanation with extensive, repeated support, not a first hunch.