Elastane is the same as Spandex. Both are yarns that are knit/woven into fabrics, and contribute stretch and recovery properties to the fabric. Spandex is DuPontâs brand, elastane is the generic name.
In Latin 'Libra' are the symbol for the scales, hence the use of lb for weight (and lbs for the multiple),
One pound (abbreviated as lb.) is equal to 16 ounces. It is hard to overlap or connect the measurements of a fluid ounce (volume) to an ounce (weight). This means that it is not possible to immediately determine the weight of a certain matter only from a given volume, per se.