Air Viscosity's relationship with temperature.

[Chocolatebear89]

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Does viscosity increase or decrease with increasing temperature and why?
Does Density increase or decrease with increasing temperature?
How is density of medium relate to its index of refraction?

 

[tartrate]

As temperature increases, viscosity decreases. Think of what happens when heating butter.

For gases, density decreases with increasing temperature.

In general, higher density denotes a higher RI.

It depends sometimes on the actual material, so the topic can be quite complex, but the MCAT will not expect you to know advanced topics (they will provide you with a background passage if needed).

 

[IntelInside]

Does viscosity increase or decrease with increasing temperature and why?
Does Density increase or decrease with increasing temperature?
How is density of medium relate to its index of refraction?

The viscosity of gases increases as temperature increases, however, and is approximately proportional to the square root of temperature. This is due to the increase in the frequency of intermolecular collisions at higher temperatures. Since most of the time the molecules in a gas are flying freely through the void, anything that increases the number of times one molecule is in contact with another will decrease the ability of the molecules as a whole to engage in the coordinated movement. The more these molecules collide with one another, the more disorganized their motion becomes.

viscosity of a fluid will decrease though