With the increase in the temperature of a liquid:-

Effect of temperature on surface tension and viscosity:

• As the temperature increases, viscosity decreases.
• Surface tension decreases with an increase in temperature.
• In general, surface tension decreases when the temperature increases because cohesive forces decrease with increased molecular thermal activity.
• The influence of the surrounding environment is due to the adhesive action liquid molecules have at the interface.
• Increasing temperature results in a decrease in viscosity because a larger temperature means particles have greater thermal energy and are more easily overcome the attractive forces binding them together.