The ideas of ratio and proportion will also be useful. Discuss with students the safety issues in the storage of chemicals. Plant directors must always be ready to combat a possible chemical spill. Ask students if they have heard of or read about a spill in the local area. Storage tanks must be built in a containment area where the substrate is prepared to contain a possible spill.
Clay soil is used as a flooring material.
Then a containment wall is built around the tank to a height that could contain all the liquid within the tank in the event of a possible rupture. Lead students in a discussion. Discuss why liquids are best stored in cylindrical containers. Review idea of a scale model using proportionality. Remind students of the purpose of a key, as on a map.