What is the maximum average density that a fully loaded cargo ship may have?

Answer 1

Depends on the size of the ship. Type of cargo, how it's configured. You can have a huge ship carrying stuffed animals that has a very small density. Or how about a ship carrying auto's? Auto's have a lot more mass and are more dense than cotton/polyester.

Answer 2

I not sure this what you want, but, here it is;

Deadweight:
Deadweight (DWT) is the load carried by a ship. It is the difference between the lightship displacement and total displacement of the ship at any time. Maximum or load deadweight is the carrying capacity of a ship measured in 2,240-pound long tons, and is the difference between the lightweight and fully loaded displacements. Deadweight includes fuel, provisions, munitions, crew and effects, cargo, or any other weight carried. For a merchant ship, cargo deadweight, paying deadweight, or payload is the part of the deadweight that is cargo and therefore earning income. It is not uncommon for the deadweight of a merchant ship to be given but not its full-load displacement. A deadweight coefficient can be defined as the ratio of full-load displacement to total deadweight. Typical values vary from 1.20 for tankers to over 1.50 for general cargo ships.
http://web.nps.navy.mil/~me/tsse/NavArchWeb/1/module4/basics.htm

Answer 3

.99999999999999 or less; otherwise it sinks........