Fundamentals of Chemical Engineering: One Question per Day – The Effect of Temperature on Viscosity
Thread Content
How does temperature affect the viscosity of liquids? What impact does it have on the viscosity of gases? The viscosity of a fluid does not necessarily decrease as temperature rises. Liquid viscosity is caused by the intermolecular cohesion; the higher the temperature, the greater the molecular vibrations, which reduces cohesion and leads to a decrease in viscosity (with very few substances exhibiting the opposite behavior). Temperature has a significant effect on liquid viscosity. As the temperature rises, the viscosity of a liquid decreases, and the degree of decrease in viscosity varies among different liquids. The change in liquid viscosity with temperature is called the viscosity-temperature behavior ； Gas viscosity is related to the thermal motion of molecules; the higher the temperature, the more intense the molecular motion, the greater the momentum exchange, the stronger the constraints between flow layers, and thus the higher the viscosity.
The viscosity of liquids decreases as temperature rises, while the viscosity of gases increases as temperature rises
The viscosity of liquids is caused by the intermolecular cohesive forces; as the temperature rises, molecular vibrations increase, these cohesive forces weaken, and thus the viscosity decreases. The viscosity of gases is related to the thermal motion of molecules; higher temperatures lead to increased molecular movement, greater momentum exchange, and increased constraints between fluid layers, which results in higher viscosity
The viscosity of a liquid is a manifestation of its cohesive forces, and its value decreases as the temperature rises. The viscosity of a gas is a result of the collisions between molecules due to their thermal motion, and its value increases as the temperature rises.
As the temperature rises, the viscosity of the liquid decreases; as the temperature drops, the viscosity of the liquid increases； Contrary to liquids, the viscosity of gases increases as temperature rises and decreases as temperature falls.
It’s just a casual opinion from someone who’s not an expert. For ordinary liquids, does a higher flow rate mean that the viscosity also decreases? I’m not familiar with gases. The important thing is to participate, hehe
How does temperature affect the viscosity of liquids? What impact does it have on the viscosity of gases? The viscosity of liquids is caused by the intermolecular cohesive forces; as the temperature rises, molecular vibrations increase, these cohesive forces weaken, and thus the viscosity decreases. The viscosity of gases is related to the thermal motion of molecules; higher temperatures lead to increased molecular movement, greater momentum exchange, and increased constraints between fluid layers, which results in higher viscosity
As an exception, sulfur has its highest viscosity at 190 degrees; decreasing or increasing the temperature within a certain range around this value will reduce its viscosity.
The viscosity of a liquid decreases as the temperature rises. The viscosity of a gas increases as the temperature rises.
The viscosity of liquids is caused by the intermolecular cohesive forces; as the temperature rises, molecular vibrations increase, these cohesive forces weaken, and thus the viscosity decreases. The viscosity of gases is related to the thermal motion of molecules; higher temperatures lead to increased molecular movement, greater momentum exchange, and increased constraints between fluid layers, which results in higher viscosity
The viscosity of liquids decreases as temperature rises, while the viscosity of gases increases as temperature rises