Differences between Theoretical and Observational Terms Observational terms and theoretical terms are quite distinct, just as their material (or potentially material) are (observational and theoretical things ). Observational terms characterize that which we can observe (not just visually, but sight is a very important aspect), or experience. Terms that describe shape, color, and other definable/measurable things are meant as observational terms. Theoretical terms are terms describing that which we cannot directly observe; for entities that are assumed to exist to explain the things we can observe. Observations (and therefore observational terms) are key to justifying theories, comparing theories, and giving meaning to theoretical terms through bridge/correspondence laws. However, there are several problems with these definitions and the distinction between the observational and the theoretical. The first stems from the definition of measurable/observable.
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