Safe Water Line

Objective:

To examine how much weight can be safely carried in a boat based on the density of the water.

To observe the relationship between salinity, water temperature, and the Plimsoll lines on the ship do the following:

The safe water line is a line on the side of a ship that shows the water level that the loaded ship can safely ride out storms without sinking. It started being used on older wooden sailing ships but is also used on steel ships. There are several lines on the sides. They show the safe water line for many kinds of water ranging from fresh tropical water to winter sea water. The density of water changes with temperature and salt content (salinity). A given weight ship will sit lower in less dense warm tropical freshwater than it will in the more dense winter seawater.