Visciosity of air and water

[stan]

hi all,

does anyone knows why the visciosity of air increases with temp while that of water decreases with temp?

dont the higher temp causes the molecules to vibrate faster, thus allowinh more space to collide with each other, the visciosity should decreases..


thanks for any advice..

stan

 

[FredGarvin]

The viscosity of a gas increases with temperature because of molecular interaction. In gases, molecular collisions transfer momentum between fluid layers. As temperature increases, the molecules move faster and more momentum is transferred between layers (layers of maolecules with a certain velocity), thereby increasing the viscosity.

In a liquid, the viscous effects are from molecular attractions between fluid layers. The higher the temps, the more energy the molecules have to overcome the attractions.

 

[ravenprp]

Hi Stan,

The reason for the difference in viscosity between air and water at different temperatures is due to their molecular structure. Air is made up of smaller, lighter molecules such as nitrogen and oxygen, which are able to move and collide with each other more easily at higher temperatures. This leads to a decrease in viscosity as the molecules are able to move more freely and flow more easily.

On the other hand, water molecules are larger and more tightly packed, making it more difficult for them to move and flow. At higher temperatures, the molecules have more energy and are able to break away from each other, reducing the overall viscosity of water.

In summary, the molecular structure of air and water play a significant role in their viscosity at different temperatures. I hope this helps answer your question!