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In this paper we present an analysis of the Runge-Kutta discontinuous Galerkin method for solving scalar conservation laws, where the time discretization is the third order explicit total variation diminishing Runge-Kutta method. We use an energy technique to prove the $\mathrm{L}^2$-norm stability for scalar linear conservation laws and to obtain a priori error estimates for smooth solutions of scalar nonlinear conservation laws. Quasi-optimal order is obtained for general numerical fluxes, and optimal order is given for upwind fluxes. The theoretical results are obtained for piecewise polynomials with any degree $k\geq1$ under the standard temporal-spatial CFL condition $\tau\leq\gamma h$, where $h$ and $\tau$ are the element length and time step, respectively, and the positive constant $\gamma$ is independent of $h$ and $\tau$.