![]() When these two papers have the same size (one square meter), we see that the Watercolor paper actually weighs more than the drawing paper (130gsm vs. So even though both Drawing and Aquarius II are listed as the same weight in pounds (80lbs), the master size sheets being weighed are not the same (again the drawing paper basis size is 24” x 36” and the watercolor paper basis size is 22” x 30”). Measuring paper weight in grams per square meter (commonly referred to as gsm or g/m 2) is literally taking the weight in grams of 1 square meter of paper. On the other hand, weighing paper in grams per square meter does give you a clean, apples-to-apples comparison. If you look at our 500 Series Aquarius II Watercolor paper, it also is listed as 80lbs, but the basis size of Aquarius II is 22”x30”, not 24”x36”, so it’s not exactly an apples-to-apples comparison. 500 Sheets of 400 Series Drawing paper (24”x 36”) weighs 80lbs. ![]() For example, drawing papers have a basis size of 24”x36”, versus watercolor papers which have a basis size of 22”x30”. The part that can get confusing when weighing paper in pounds is that not all paper types have the same basis size. If you place 500 master sheets of our 400 Series Watercolor paper in the 22”x30” size on a scale, it would weigh approximately 140lbs. For example, the basis size (or in other words, the master sheet size) of our Watercolor papers is 22”x30”. and is determined by weighing 500 sheets (a ream) in the basis size of a particular paper. The United States measures paper weight in pounds, whereas it is standard to measure in grams per square meter (g/m²) outside of the US. There are two ways that paper weight is measured and stated.
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