Proust's law of constant proportions states that a given chemical compound always contains its component elements in fixed ratio (by weight). The ratio does not depend on its source and method of preparation.
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proportion
Two variables, X and Y, are said to be in direct proportion if X/Y is a constant. Equivalently, Y = cX for some constant c.
It is the constant of proportionality.
Joseph Proust.
Weber's Law"Ernst Weber noted that for people to really perceive a difference, the stimuli must differ by a constant "proportion" not a constant "amount."