English: So assuming that we can actually write it as rho plus del rho by del X into Delta X by 2. So, this is the density at the exiting surface at the X direction, that is the surface DC multiplied by velocity U, that is what we have written here, U plus del U by del X into Delta X by 2. So, this is rho, density at the exiting surface, velocity at the exiting surface multiplied by the surface area.
Telugu: కాబట్టి, ఇది X దిశలో నిష్క్రమించే ఉపరితలం వద్ద సాంద్రత, ఇది ఉపరితల DC వేగంతో U గుణించి, మేము డెల్ X చే డెల్ ఎక్స్ ద్వారా 2 చేద్దాం.