What is the principle of falsifiability?

The principle of ‘falsibility’ was advanced by 20th century Austrian-English philosopher, Karl Popper, to demarcate statements of science versus statements of pseudoscience.  Falsification principle states that all scientific hypothesis leaves a possibility that an experimental outcome would falsify it. If for instance, a hypothesis state that all metals expand on increase of ambient temperature, a single conclusive example of a metal that doesn’t expand with increase in temperature would falsify the statement. A statement that does not extend a possible future condition that would go against it, is NOT a scientific statement. In other words, scientific hypothesis should ‘stick its neck out’ when it is framed.  According to Popper, this ability of scientific statements to expose the condition of its own falsification is the essential feature of ‘true science’. Pseudosciences, on the contrary, do not expose themselves like this. Rather, it would ‘explain out’ the situations that have emerged contrary to their initial statement. Thus, pseudosciences won’t let itself be refuted by objective evidence, but would rather ‘somersault’ with adhoc or posthoc explanations.

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