When the temperature increases, the viscosity of
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An increase in temperature decreases the intermolecular forces present between liquid molecules and increases collision of gas molecules.
- gas decreases and liquid increases
- gas increases and liquid decreases
- gas and liquid increases
- gas and liquid decreases
The Correct Option is B
Solution and Explanation
Viscosity is defined as the resistance to the change in shape or movement of a fluid (liquid or gas). In simple words, viscosity is the opposition to the flow by a fluid.
An increase is temperature has different effects on the viscosity of a liquid and a gas.
- With increase in temperature, the cohesive forces present in the liquid decreases, thereby increasing the rate of molecular interchange. Thus, the viscosity of a liquid decreases with increase in temperature.
- On the other hand, the molecules of gases are far apart from each other. An increase in temperature causes these molecules to move faster and collide with each other. This collision results in an increased resistance, thereby increasing the viscosity.
Hence, with increase in temperature, the viscosity of gas increases while that of liquid decreases.
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Concepts Used:
Mechanical Properties of Fluid
The science of the mechanical properties of fluids is called Hydrostatics. A fluid is a substance that relents to the slightest pressure. Fluids are categorized into two classes famed by the names of liquids, and elastic fluids or gases, which later comprehend the air of the atmosphere and all the different kinds of air with which chemistry makes us acquainted.
Streamline Flow:
A streamline is a curve the tangent to which at any point provides the direction of the fluid velocity at that point. It is comparable to a line of force in an electric or magnetic field. In steady flow, the pattern of the streamline is motionless or static with time, and therefore, a streamline provides the actual path of a fluid particle.
Tube of Flow:
A tubular region of fluid enclosed by a boundary comprises streamlines is called a tube of flow. Fluid can never cross the boundaries of a tube of flow and therefore, a tube of flow acts as a pipe of the same shape.
Surface Tension and Viscosity:
The surface tension of a liquid is all the time a function of the solid or fluid with which the liquid is in contact. If a value for surface tension is provided in a table for oil, water, mercury, or whatever, and the contacting fluid is unspecified, it is safe to consider that the contacting fluid is air.