a gas - enriched liquid delivered at a site of interest that is substantially bubble free after delivery into a lower pressure liquid or gas environment . the delivered gas - enriched liquid is produced by a process comprising the steps of : a ) preparing a mixture of gas and liquid ; b ) compressing the mixture to a pressure such that the gas completely dissolves in the liquid to form a gas - enriched liquid ; c ) enclosing the gas - enriched liquid within a confined space while retaining substantially the same pressure . the confined space has at least one dimension less than about 0 . 2 mm , and has at least one opening to a liquid or gas environment site of interest having a lower pressure than that of the pressure of the confined space ; and d ) delivering the gas - enriched liquid from the confined space out through the at least one exit opening to the lower pressure environment without formation of bubbles .