This article, published by William Sutherland in 1893, explores the relationship between the viscosity of gases and molecular forces. Sutherland argues that the kinetic theory of gases, which posits that the viscosity of a gas is independent of pressure, can be reconciled with experimental observations by considering the effects of molecular forces. He demonstrates that the viscosity of gases is influenced by the deflection of molecular paths due to attractive forces between molecules, which increases the number of collisions and thus affects viscosity. Sutherland provides a theoretical framework to calculate the viscosity of gases, taking into account the molecular force, and compares these calculations with experimental data for various gases. The article also discusses the implications of molecular forces on other properties such as thermal conductivity and characteristic equations, suggesting that molecular forces play a crucial role in understanding these phenomena. Sutherland's work contributes to the development of the kinetic theory of gases and provides a more comprehensive explanation for the behavior of gases at different temperatures and pressures.This article, published by William Sutherland in 1893, explores the relationship between the viscosity of gases and molecular forces. Sutherland argues that the kinetic theory of gases, which posits that the viscosity of a gas is independent of pressure, can be reconciled with experimental observations by considering the effects of molecular forces. He demonstrates that the viscosity of gases is influenced by the deflection of molecular paths due to attractive forces between molecules, which increases the number of collisions and thus affects viscosity. Sutherland provides a theoretical framework to calculate the viscosity of gases, taking into account the molecular force, and compares these calculations with experimental data for various gases. The article also discusses the implications of molecular forces on other properties such as thermal conductivity and characteristic equations, suggesting that molecular forces play a crucial role in understanding these phenomena. Sutherland's work contributes to the development of the kinetic theory of gases and provides a more comprehensive explanation for the behavior of gases at different temperatures and pressures.