[ilÂ´e-al] pertaining to the ileum. ileal conduit use of a segment of the ileum for the diversion of urinary flow from the ureters. The segment is resected from the intestine with nerves and blood supply intact. The proximal end of the segment is closed, forming a pouch, and the ends of the ureters are sutured to it.
Convection. Liquids and gases are fluids. The particles in these fluids can move from place to place. Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Liquids and gases expand when they are heated.
Convection is of two types: natural and forced. Heated air rising is an example of natural convection. Hot air has a lower density than that of the cooler air in the atmosphere above it and therefore is buoyant; as it rises, however, it loses energy and cools.