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I am trying to understand the stress-energy tensor. Say you have a gas of particles moving with random direction, but all with mass ##m## and velocity ##v## in a frame where the centre of mass is at rest. The contribution to the flux of x-momentum of a particle moving with ##\vec p = p \vec e_x## would be the same as that of another with ##\vec p = - p \vec e_x## and the total would be ## 2pv / A## , where A is the Area of the considered element of the gas. Is this correct?