Why does viscosity increase with temperature in a gas?

Why does viscosity increase with temperature in a gas?

From the basis of the kinetic theory of gases, viscosity in gases increases with temperature because the increase in kinetic energy will increase the frequency of collisions between the molecules.

How does the viscosity of liquid and gases vary with temperature?

The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature. Thus, upon heating, liquids flow more easily, whereas gases flow more sluggishly.

Why does the viscosity of a gas increase with the increase in temperature while that of a liquid decreases with the increase in temperature?

Viscosity in liquid is mainly due to the cohesive force(inter molecular force of attraction). Increase in the temperature reduces the cohesive forces between the molecules of liquid and hence the viscosity decreases. Whereas in case of gasses viscosity is mainly due to the random movements of the gaseous molecules.

Why does the viscosity of a liquid decrease with temperature but the viscosity of a gas increases with temperature?

According to particle theory in liquid, the molecules are loosely packed as compared to gases. When temperature increases the energy level of liquid molecules increases and the distance between the molecule increases. It causes a decrease in intermolecular attraction between them, which reduce viscosity.

Why does the viscosity of a liquid increase with temperature?

With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.

Why does the viscosity of liquids decrease with temperature?

When a liquid is heated, the kinetic energy of its molecules increases and the intermolecular attraction becomes weaker. Hence, the viscosity of a liquid decreases with increase in its temperature.

Why does the viscosity of liquids increase with temperature?

Why does the viscosity of a liquid increases with temperature?

Both cohesion and molecular interchange contribute to liquid viscosity. The impact of increasing the temperature of a liquid is to reduce the cohesive forces while simultaneously increasing the rate of molecular interchange. The former effect causes a decrease in the shear stress while the latter causes it to increase.

Why does the temperature of a liquid decrease when viscosity is increased?

Increasing temperature results in a decrease in viscosity because a larger temperature means particles have greater thermal energy and are more easily able to overcome the attractive forces binding them together.

Why does viscosity of liquid decreases as the temperature is raised?

When temperature of liquid increases, the average kinetic energy of molecules increases. As a result, the molecules overcomes the intermolecular attractive forces between them as a result of which viscosity of a solution decreases. As temperature increases, the viscosity of liquids decreases considerably.

Why does viscosity of a liquid tend to increase when the molecules that make up the liquid get longer?

Viscosity increases with increasing molar mass (and increasing magnitude of dispersion forces) and increasing length (and increasing potential for molecular entanglement). Viscosity also depends on temperature because thermal energy partially overcomes the IMF, allowing molecules to flow past each other more easily.

How does viscosity change with temperature in liquids and gases?

Hence in liquids, the viscosity is mainly due to intermolecular cohesion, while in gases viscosity is mainly due to molecular momentum transfer. The intermolecular cohesive force decreases with the rise of temperature and hence with the increase in temperature the viscosity of a liquid decreases.

What is the dynamic viscosity of a fluid?

Thus, the dynamic viscosity of a fluid may be defined as the shear stress needed to produce unit rate of angular deformation. Based on the property of viscosity, fluids may be classified into the following types: (i) Ideal fluid – This is a fluid where shear stresses do not exist whether the fluid is at rest or in motion.

How does temperature affect the intermolecular attraction between molecules?

The inter-molecular attraction is strong. When temperature increases, the energy level of liquid molecules increases and the distance between the molecule increases. It causes a decrease in inter-molecular attraction between them, which reduce viscosity.

Why is viscosity an example of momentum exchange in fluids?

Physically in Liquids , 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 thus produces the effect of viscosity . & molecule may move one layer to another thus viscosity is one of momentum exchange.