What is an ullage report

The ullage is the empty space in a closed bottle. So in a bottle of water, the ullage is between the surface of the water and the bottom of the bottle cap.

Ullage is the empty space in the tank.

Ullage refers to the space between the level of the wine and the top of the bottle. It tends to increase with age.

Ullage is the empty space in a container. This usually refers to a gas or oil storage container. An ullage report states the difference between the height of the cargo and the roof of the container.