ORLANDO, Fla.—For chemical recycling to work effectively, some plastics and consumer product companies say governments need to embrace very technical but important standards called mass balance.

The International Bottled Water Association (or “IBWA”) challenged over 50 express and implied claims by Boxed Water is Better (or “BWIB”), suggesting that boxed water is better for the environment.

Buoyancy corrections can become important when the density of the object being weighed is very different from the density of the masses employed for the calibration function. For example, this is true ...