What is the effect of an increase in temperature on viscous liquids?

What is the effect of an increase in temperature on viscous liquids?

• A. Flow faster and increase in weight
• B. Flow faster and decrease in weight
• C. Flow slower and increase in weight
• D. Flow slower and decrease in weight

Answer: (A)

An increase in temperature generally has the effect of decreasing the viscosity of viscous liquids. As temperature rises, the molecules within the liquid gain kinetic energy, which reduces the intermolecular forces that contribute to viscosity. This decrease in viscosity allows the liquid to flow more easily and quickly. Regarding the weight aspect, the mass of the liquid remains constant regardless of temperature changes; however, the density may decrease as temperature increases. This leads to a situation where, while the liquid flows faster when warmed, it may appear to have a reduced weight per unit volume when considering density, but not in terms of total mass. The choice indicates an increase in weight, which does not accurately reflect the relationship between temperature and the physical properties of viscous liquids. Therefore, the correct response should recognize that while viscosity decreases with an increase in temperature, the assertion about weight does not align with the principles of fluid mechanics.

An increase in temperature generally has the effect of decreasing the viscosity of viscous liquids. As temperature rises, the molecules within the liquid gain kinetic energy, which reduces the intermolecular forces that contribute to viscosity. This decrease in viscosity allows the liquid to flow more easily and quickly.

Regarding the weight aspect, the mass of the liquid remains constant regardless of temperature changes; however, the density may decrease as temperature increases. This leads to a situation where, while the liquid flows faster when warmed, it may appear to have a reduced weight per unit volume when considering density, but not in terms of total mass.

The choice indicates an increase in weight, which does not accurately reflect the relationship between temperature and the physical properties of viscous liquids. Therefore, the correct response should recognize that while viscosity decreases with an increase in temperature, the assertion about weight does not align with the principles of fluid mechanics.