Effect of Temperature on Liquid Viscosity

Viscosity is a measure of a fluid's resistance to flow. In liquids, this resistance is primarily due to the intermolecular attractive forces between molecules.

Molecular Behavior Explanation

• Intermolecular Forces: Liquids have significant attractive forces between their molecules. These forces hinder the movement of molecules past each other, contributing to viscosity.
• Kinetic Energy: Temperature is a measure of the average kinetic energy of the molecules.
• Effect of Heat: When the temperature of a liquid is increased, the kinetic energy of its molecules increases.
• Overcoming Forces: This higher kinetic energy allows the molecules to overcome the intermolecular attractive forces more easily.
• Result: As molecules can move past each other more freely, the liquid's resistance to flow (viscosity) decreases.

Conclusion

Therefore, on increasing the temperature of a liquid, the viscosity of the liquid decrease.