I am promoting discussion about the question What is a uncertainty in Science? Uncertainty is definitely linked to probability. Probability is a definite number (one number) between 0 and 1 So it is tempting to think that if the probability is p then the uncertainty can be defined as (1-p), but this doesn't really work. Consider a cubical shaped object. What is the uncertainty of position when I place it along a line? Let my cube be a model of my car and of side L.