The density is the amount of plastic in an area or volume of water, rather than the density of a particular piece of plastic. It's the difference between 1 bot

The density is the amount of plastic in an area or volume of water, rather than the density of a particular piece of plastic. It's the difference between 1 bottle cap worth of plastic in kilometers of open ocean and kilograms of plastic in a few square meters. It lets you quantify the problem, and actually measure the severity, knowing where it is a problem and if it gets worse over time.