In פרשת בשלח 16:14, it says --
The layer of dew went up, and behold, on the surface of the desert, a fine, bare [substance] as fine as frost on the ground.
On that verse, Rashi says (translated from here)
When the sun would shine, the dew upon the manna would rise toward the sun, as it is natural for dew to rise toward the sun. [This is similar to] even if you fill an egg shell with dew, close up its opening, and place it in the sun, it [the egg shell] will rise by itself in the air
Is this actually true scientifically? Has anyone ever tried or seen this?