【Daily Question】Chemical Analysis Edition, 4/16/2021
Thread Content
How do the viscosities of liquids and gases change with temperature? The viscosity of a liquid decreases as the temperature rises ； Gas viscosity increases as temperature rises.
Under normal circumstances, liquids should shrink as temperature rises, while gases do the opposite. It seems that this phenomenon is explained by the distance between molecules; I’m not very good at describing the more theoretical aspects in detail.
The viscosity of liquids is caused by the intermolecular cohesive forces; as the temperature rises, molecular vibrations increase, these cohesive forces decrease, and thus the viscosity drops. The viscosity of gases is related to the thermal motion of molecules; as the temperature increases, molecular motion intensifies, momentum exchange increases, and the constraints between fluid layers grow, resulting in higher viscosity
The viscosity of a liquid decreases as the temperature rises； Gas viscosity increases as temperature rises.
The viscosity of gases increases as temperature rises, while that of liquids decreases. Liquid molecules are close to each other due to short distances between them; an increase in temperature raises the molecular kinetic energy, facilitating movement between molecules and thereby increasing the fluid’s dynamic viscosity ； Gas molecules are far apart from each other and relatively independent; an increase in temperature raises the molecular kinetic energy, but it also increases the frequency of collisions between molecules, which in turn increases the dynamic viscosity of the gas
The viscosity of gases increases as temperature rises, while that of liquids decreases. Liquid molecules are close to each other due to short distances between them; an increase in temperature raises the molecular kinetic energy, facilitating movement between molecules and thereby increasing the fluid’s dynamic viscosity ； Gas molecules are far apart from each other and relatively independent; an increase in temperature raises the molecular kinetic energy, but it also increases the frequency of collisions between molecules, which in turn increases the dynamic viscosity of the gas
The viscosity of gases increases as temperature rises, while that of liquids decreases
The viscosity of gases increases as temperature rises, while that of liquids decreases. Liquid molecules are close to each other due to short distances between them; an increase in temperature raises the molecular kinetic energy, facilitating movement between molecules and thereby increasing the fluid’s dynamic viscosity ； Gas molecules are far apart from each other and relatively independent; an increase in temperature raises the molecular kinetic energy, but it also increases the frequency of collisions between molecules, which in turn increases the dynamic viscosity of the gas
The viscosity of gases increases as temperature rises, while that of liquids decreases. Liquid molecules are close to each other due to short distances between them; an increase in temperature raises the molecular kinetic energy, facilitating movement between molecules and thereby increasing the fluid’s dynamic viscosity ； Gas molecules are far apart from each other and relatively independent; an increase in temperature raises the molecular kinetic energy, but it also increases the frequency of collisions between molecules, thereby increasing the dynamic viscosity of the gas.