public ForcePerLength surface_tension() { if (Environment.Is64BitProcess) { if (0 < Q() && Q() < 1) { return(ForcePerLength.FromNewtonsPerMeter(CoolPropPINVOKE64.AbstractState_surface_tension(swigCPtr))); } } else { if (0 < Q() && Q() < 1) { return(ForcePerLength.FromNewtonsPerMeter(CoolPropPINVOKE.AbstractState_surface_tension(swigCPtr))); } } return(ForcePerLength.Zero); }