Correct option is A
When two adjacent layers of a fluid are in
relative motion, they resist each other's movement. This resistance is due to the
fluid’s viscosity, which is a fundamental property determining how easily a fluid flows.
Effect of Pressure on Viscosity:
· Pressure has
no significant effect on the viscosity of
liquids or gases.
· Experimental studies show that increasing or decreasing pressure
does not change the
cohesive forces or the
random motion of molecules.
High Viscosity and Molecular Structure:
· A
high-viscosity fluid has molecules that are
closely packed together.
· This gives the fluid a
semi-liquid appearance due to its thick consistency.
Examples:
·
Cough syrup vs. water:
· The molecules in
cough syrup are packed more closely than in water, making it
more viscous.
· Water, with a lower viscosity, flows more freely compared to syrup.
