2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/88005When a substance that shrinks in volume as it solidifies (for example, lead) is melted in a container and then cooled, a deep hole is often found in the center after resolidification. We use a simple model to describe the shape of the pipe and compare it with experimental results.3 pages, 6 figuresPhysics EducationGeneral Physicstext