Table of Contents
What is internal friction how does it relate to viscosity?
Viscosity is the internal friction due to molecular cohesion in fluids which results in resistance to flow. As temperature increases, the viscosity will decrease. As a result, viscosity measurements are always reported with the temperature at which the measurement is made.
What is internal friction of a fluid?
Internal fluid friction is a property of all fluids and is a result of the interactions between the molecules of the fluid. It can also be thought of as viscosity, which is the measure of a fluid’s resistance to flow because of its internal friction.
Is viscosity caused by friction?
Introduction: Friction at the Molecular Level Viscosity is, essentially, fluid friction. Like friction between moving solids, viscosity transforms kinetic energy of (macroscopic) motion into heat energy.
What does viscous friction mean?
Viscous friction. The resistive force between surfaces in relative motion through a fluid (liquids & gases). Air resistance or aerodynamic drag is a type of viscous friction. Viscous friction is dealt with in a different section of this book.
How does frictional force differ from viscosity?
The main difference between friction and viscosity is that friction is used to refer to forces that resist relative motion, in general, whereas viscosity refers specifically to resistive forces that occur between layers of a fluid when fluids attempt to flow.
What is the definition of viscosity in chemistry?
Viscosity is a measure of a fluid’s resistance to flow. It describes the internal friction of a moving fluid. A fluid with low viscosity flows easily because its molecular makeup results in very little friction when it is in motion.
What is viscosity in fluid?
Viscosity is the resistance of a fluid (liquid or gas) to a change in shape or movement of neighbouring portions relative to one another. Viscosity denotes opposition to flow.
How does viscosity affect fluid friction?
The viscosity of fluid plays a major role in determining the velocity of the object which flows through it. The more viscous is the fluid the denser it is and hence the movement of any material inside it is restricted or experiences resistance to its motion. The denser is the liquid the more viscous drag it creates.
Is viscous force a frictional force?
For this reason, viscosity is often referred to as fluid friction. Like other frictional forces, viscous forces oppose the relative motion of adjacent fluid layers. Whereas solid frictional forces are approximately independent of velocity, viscous forces increase with velocity, as shown in Example 8.
Does cohesion affect viscosity?
Due to strong cohesive forces between the molecules, any layer in a moving fluid tries to drag the adjacent layer to move with an equal speed and thus produces the effect of viscosity as discussed earlier. Since cohesion decreases with temperature, the liquid viscosity does likewise.