A Crown Prince or Crown Princess is the heir or heiress apparent to the throne in a royal or imperial monarchy. The wife of a crown prince is also titled crown princess. In Europe, lineal succession conventions usually dictate that the eldest child (as in Sweden, Belgium, Norway and the Netherlands) or the eldest son of the current monarch (Spain, United Kingdom, Denmark) fills this role as Crown Prince or Crown Princess..
Hydrostatics is the branch of fluid mechanics that studies incompressible fluids at rest. It encompasses the study of the conditions under which fluids are at rest in stable equilibrium as opposed to fluid dynamics, the study of fluids in motion.
What is a hydrostatic skeleton? A: A hydrostatic skeleton is an exoskeleton that maintains its form due to the pressure of fluid inside the skeleton. The coelom is the term for the cavity that holds the fluid; it works in conjunction with nearby muscles to keep the skeleton's shape. Without the fluid's pressure, the body would collapse.