NOVELTY - A liquid-gas separator (100) comprises hollow ball shaped main body (110), gas extraction membranes (120), inlet in main body, outlet (140) in main body, and flexible tube (150). The gas extraction membranes are attached to an opening (112) in the main body to selectively extract the gas from the main body. The inlet in the main body is used to guide the liquid and the gas into the main body. The outlet in the main body is used to guide the liquid to the outside of the main body.    USE - The separator is used to separate the liquid, e.g. carbon dioxide from the gas or unreacted liquid fuel discharged from anode electrode useful for direct liquid feed fuel cell used in generating electricity.    ADVANTAGE - The invention allows direct liquid fuel cell to perform well regardless of the position of the liquid-gas separator. It does not allow carbon dioxide to enter the anode electrode and discharged unreacted fuel to the outside.    DETAILED DESCRIPTION - A liquid-gas separator comprises hollow ball shaped main body, gas extraction membranes, inlet in main body, outlet in main body, and flexible tube. The gas extraction membranes are attached to an opening in the main body to selectively extract the gas from the main body. The inlet in the main body is used to guide the liquid and the gas into the main body. The outlet in the main body is used to guide the liquid to the outside of the main body. The flexible tube has a hollow structure. One end of the flexible tube is connected to the outlet and other end of the tube contacts the liquid fuel in the main body.    An INDEPENDENT CLAIM is also included for direct feed fuel cell system comprising a fuel cell stack to generate electricity; liquid-gas separator to receive an unreacted liquid fuel and a gas product from an electrochemical reaction in the fuel cell stack and to exhaust the gas and deliver the liquid fuel to an anode of the fuel cell stack; and a fuel tank to hold the liquid fuel for the fuel cell stack.    DESCRIPTION OF DRAWING(S) - The figure shows liquid gas separator.    Liquid-gas separator (100)    Hollow ball shaped main body (110)    Opening (112)    Gas extraction membranes (120)    Outlet (140)    Flexible tube (150)