Date: Mon Nov 9 15:51:58 2009

Author: Richard Berg

Subject: Re: Lightning affects rainbows?!


It looks to me like the whole thing changes its "look" at some time. When
you have a lightning strike and the concomitant high pressure heat pulse
leaving the region it can result in adiabatic cooling when the pulse
expands. This would cause additional condensation of water vapor in the
region and lead to the effect that we see. This is what you see in an
atomic bomb explosion such as this one:

Rapid expansion of the air in the region of the explosion leads to
adiabatic cooling, forming lots of small water droplets which we view as a
white cloud.

Dr. Richard E. Berg, Professor of the Practice
Physics Lecture-Demonstration Facility
U.S. mail address:
Department of Physics
University of Maryland
College Park, MD 20742-4111
Phone: (301) 405-5994
FAX: (301) 314-9525