Abstract: A method and a machine for preparing beverages, wherein the machine has a liquid feeding unit, a gas source at atmospheric pressure, an infusion chamber and an infusion circuit; wherein during a dispensing cycle for preparing a beverage the method provides the following steps: at least partially filling the circuit with gas at atmospheric pressure by means of said gas source; feeding the liquid into the circuit by means of said feeding unit so as to push inside the infusion chamber, filled with the infusion product, some gas already present in the circuit before the inlet of the liquid; and dispensing the beverage.