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deltaT in calculation of time step continuity errors

Hi,

Right now I'm inspecting the code in "continuityErrs.H" and couldn't figure out what deltaT is doing there? Does somebody know why we are multiplying weighted sum of the fluxes with deltaT?

Thanks.

Code:

    volScalarField contErr = fvc::div(phi);



    scalar sumLocalContErr = runTime.deltaT().value()*

        mag(contErr)().weightedAverage(mesh.V()).value();



    scalar globalContErr = runTime.deltaT().value()*

        contErr.weightedAverage(mesh.V()).value();

    cumulativeContErr += globalContErr;