# Topics - Reduced plate height

**reduced plate height**and the

**reduced mobile phase velocity**was introduced by Giddings. The curve relating reduced plate height to reduced mobile phase velocity provided curves from which the packing efficiency could be assessed. The

**reduced plate height is the plate height measured in units of the mean diameter of the particles of the packing. Thus, it is the plate height in centimeters divided by the particle diameter in centimeters.The**

**reduced mobile phase velocity**is the product of the linear mobile phas velocity and the paricle diameter devided by the Diffusivity of the solute in the mobile phase.