Physics Help Forum Air refraction as function of TEMPERATURE

 Sep 27th 2017, 01:14 AM #1 Junior Member   Join Date: Sep 2017 Posts: 1 Air refraction as function of TEMPERATURE I have been looking for a chart/function but couldnt find. I need it to do studies on a Schlieren set-up, which relies on the difference of density, thus variations of the air refraction, to make air flow visible. Hereby I attach a video that explains it better So, I would appreciate if anybody has such information: Air refraction ~ Temperature (standard Pressure conditions)
 Sep 27th 2017, 09:29 AM #2 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 756 Surely its not going to be a function of temperature alone? The humidity will also change with temperature, and this will in turn affect the refractivity.
 Sep 27th 2017, 12:29 PM #3 Senior Member     Join Date: Jun 2016 Location: England Posts: 378 I am not sure that there is a significant change of refraction with temperature at standard pressure, however there is a change with density. Naturally (if pressure is constant) changes in temperature will cause changes in density, but it is the changes in density that are showing on the Schlieren. So you need to look for the effect of air density on the refractive index; then look, separately, at the effect of temperature on the air density. __________________ ~\o/~
 Sep 28th 2017, 04:25 PM #4 Senior Member   Join Date: Apr 2015 Location: Somerset, England Posts: 756 My Kaye and Laby publishes refractive index data for air including some formulae for the temperature variation. They have an online version these days.

 Tags air, function, refraction, schlieren, temperature

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