Purchase: http://hilaroad.com/video/ This video explains how to calculate the weight of a horse using Archimedes' Principle. Includes a demonstration with digital scales and overflow apparatus. The forces acting on hot air balloons, cargo and cruise ships is explained by this principle from the ancient Greeks. Marine architects and engineers use this basic principle to design floating structures - ships, submarines and oil rigs. Suitable as a learning resource for an introduction to buoyancy and Archimedes in physics and general science.