observable

An observable is something that can be perceived or detected, often through the senses or scientific instruments. In the context of science, observable phenomena are those that can be directly seen or measured. This contrasts with theoretical entities or concepts that are not directly perceivable, such as electrons or atoms.1234

The concept of observability is central to empiricism, a philosophical approach that emphasizes knowledge gained through observation and experience. Scientific empiricism, in particular, seeks to unify scientific methodologies and focuses on analyzing language to understand scientific knowledge. This approach distinguishes between observational language, which uses terms for directly perceivable things, and theoretical language, which describes unobservable entities.563