A number of statistical methods that are deemed particularly useful in chemical engineering are briefly illustrated. The topics covered are : sampling plan and statistical tests, response surface method, variable screening, and model discrimination. None of the topics is covered in any detail. The objective here is to acquaint the practising chemical engineers with what statistics can do for them and thus stimulate their interest, with the hope that they will explore these topics in depth on their own.

The gas-liquid phase equilibria at low temperatures and high pressures have been studied both experimentally and theoretically for the helium-carbon tetrafluoride and helium-chlorotrifluoromethane systems. An exact thermo-dynamic expression for the gas phase equilibrium composition was obtained for the prediction of the gas phase composition. Of the various theoretical models used for the evaluation of this expression, the virial equation of state based on the Lennard-Jones (6-12) classical potential function and the Kihara potential function with a correction to the geometric mixing rule for its mixture energy parameter gave quite satisfactory prediction of the gas phase compositions.

To clarify the effect of additives on the reduction rate of hematite with hydrogen and the role of additives, the loss of weight, the lattice constant, and the electrical conductivity have been measured for pure and doped hematite. The reduction rate was increased and the electrical conductivity was decreased by the addition of and trivalent oxides ( and ). The effect of additives on the electrical conductivites is discussed in term of electron transfer mechanism. In the temperature range of , hematite is directly reduced to metallic iron. The kinetic data show good agreement with Avrami equation.

The salient features of Lauan-Polystyrene Composite using monomer emulsion, as it differs from composite using pure styrene both on the distribution of polymer in wood and mechanical behavior of products, are discussed. Wood reinforcing is achieved by loading styrene emulsion and pure styrene and by subsequent thermal polymerization. Uniformity of polymer in wood is discussed in connection with specific gravity variation, and mechanical properties are also determined. It appeared that monomer emulsion played an important role of enhancing both the uniformity and mechanical strengths.

The reaction rate constant in the spinel formation reaction from nickel oxide and alumina polycrystalline was measured at temperatures ranging from 1,050 to in air. Comparsion of experimental and theoretical values of the rate constants showed that the diffusion process of aluminium ions through the spinel layer was rate controlling.