A gallon of freshwater at 39.2ºF, or 4ºC and a specific gravity of 1.000 weighs 8.3454 lbs. The weight of the water will increase directly proportionate to the weight of the salt being dissolved in the water. 1 gallon of water 8.3454 lbs times the specific gravity of say 1.025 equals 8.5540 lbs (8.3454 x 1.025 = 8.5540).
Medium-weight linen bedsheets often have a GSM of 160, though thick, high-end sheets usually have a greater weight. 180 GSM Fabric. One of the most popular uses for fabric in a weight of 180 GSM is the standard cotton knit t-shirt. Of course, you can buy tees in various weights, but 180 GSM is the most popular. 0no6.