Abstract: A gas migration inhibitor which lyes on a surface of a material to inhibit the migration of gas from the material. This migration inhibitor has a specific gravity of less than a liquid in which it is placed, floating on a surface of such material within a container in which the liquid material is held, and is non porous so as to inhibit the escape of gas from the material, or the evaporation of the material.

Abstract: Heat collection and dissipation are provided utilizing a roofing system having a support sheet with an upstanding edge around its periphery and a pair of water impermeable membranes disposed in the volume defined by the support sheet and upstanding edge. Water is pumped from a storage tank to an inlet between the membranes for filling the membranes with water, and from an outlet at a drain point for withdrawing water from between the membranes. Air between the membranes is exhausted through a valve. The water storage tank associated with the roofing system has an outer surface with a number of vertical interior divisions defining the volume into compartments. A liquid conduit extends from the top of each conduit to the bottom of the adjacent conduit, and an inlet is provided to the bottom of one of the compartments and an outlet is provided from the top of one of the compartments.