pound weight

(lb wt or lb)
   a traditional U.S. unit measuring the weight or thickness of paper. Paper is described as, say, 24 pound weight if one ream (500 sheets) cut in a standard size (called the base size or basis size) has a mass of 24 pounds. For bond paper, the base size is 17 inches by 22 inches (43.18 by 55.88 centimeters), exactly four times the area of an 8.5 inch by 11 inch sheet. This means a ream of 8.5 inch by 11 inch, 24-pound bond paper has a mass of 6 pounds. A table of basic sizes is provided. The metric measure of paper weight is the areal density in grams per square meter (g/m2 or "gsm"). 1 lb wt is equivalent to 3.76 g/m2 for bond paper, 1.48 g/m2 for text stock, 2.70 g/m2 for card stock, and varying amounts for the other types of paper.

Dictionary of units of measurement. 2015.

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