I also see a weight associated with the art paper I buy.
For example: I have Bristol Board that is marked 100lbs, Pastel Paper marked 98lb, Sketch Paper marked 50lbs, etc.
What does this mean?
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The weight is the weight of a ream (500 sheets) in the unit of uncut size, which varies with the stock type See Here.
A more consistent measure of paper weight is the grams per sq metre value (gsm) which is what it says, the mass of 1 square metre of the paper, which is the area density of the paper.