An actuator including a housing defining a volume changeable chamber therein, the volume changeable chamber being divided into a first volume changeable subchamber, a second volume changeable subchamber, a separator disposed between the first volume changeable subchamber and the second volume changeable subchamber, the separator initially preventing mixing of substances in the first volume changeable subchamber and in the second volume changeable subchamber and at a selected time allowing fluid movement between the first and second volume changeable subchamber. A method for actuating a tool including triggering a separator between a first volume changeable subchamber having a first substance therein and a second volume changeable subchamber having a second substance therein within a housing containing the first volume changeable subchamber and the second volume changeable subchamber. A borehole system including a borehole in a subsurface formation, and an actuator disposed in the borehole.