Aspects and embodiments of the invention provide methods and systems of infusing liquid into gas. One method according to an aspect of the invention comprises: filling a chamber having a fixed volume with a first gas content at a first pressure: subjecting the gas content to a high-pressure injection of liquid content into the chamber at a second pressure, wherein, the second pressure is higher than a predetermined pressure saturation requirement of the liquid content. One system according to an aspect of the invention comprises: a cylinder (200) comprising at least one chamber of fixed internal volume and having a first end (200a) and a second end (200b); a floating piston (202) arranged within the internal volume of the chamber; a first gas input port that is selectively connected to the first end of the chamber; a second gas input port that is selectively connected to the second end of the chamber; a first liquid input port that is selectively connected to the first end of the chamber; a second liquid input port that is selectively connected to the second end of the chamber; a first exhaust port that is selectively connected to the first end of the chamber; and a second exhaust port that is selectively connected to the second end of the chamber.