The physical property of being viscous
On continuing the heating, the viscosity diminishes while the colour remains the same.
The branch of hydrodynamics which discusses wave motion in a liquid or gas is given now in the articles Sound and Wave; while the influence of viscosity is considered under Hydraulics.
The effects of friction and viscosity in diminishing the velocity of running water were noticed in the Principia of Sir Isaac Newton, who threw much light upon several branches of hydromechanics.
Maxwell himself verified this prediction experimentally for viscosity over a wide range of pressure.