The jnd value for weights is approximately 1/50. If you can lift a weight of 500 grams, a comparison weight must weigh at least gram(s) more in order for you to be able to judge it as heavier.

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The jnd (just noticeable difference) value for weights is 1/50, meaning the comparison weight must be 1/50 of the original weight more to be perceived as heavier. For a 500-gram weight, this is 1/50 x 500 = 10 grams.

The Jnd Value for Weights Is Approximately 1/50