The ionic product for water is defined by. KW = [H3O+][OH-] For water at standard temperature and pressure, it is 1.00 x 10-14 mol2/dm6. pKW (which is equivalent to the pH) will be 7 at room temperature, because it is the -log10 of KW, and -log10 of the square root of 1x10-14 is 7.
Lightning has been the second largest storm killer in the U.S. for the last 40 years, exceeded only by floods. A lightning strike can result in a cardiac arrest (heart stopping) at the time of the injury, although some victims may appear to have a delayed death a few days later if they are resuscitated but have suffered irreversible brain damage.
The effect of radiation and nuclear fall out is varied on humans. Find out about the effects of military or industrial use, and the scars it leaves on the environment. Human impacts from nuclear weapons. A nuclear explosion has three stages of effect: heat wave, pressure wave and radiation. The heat wave burns because of the explosion which causes massive fires. There are also injuries from the flying objects resulting from the blast and pressure wave.