Not only acids and bases dissociate, water dissociates too: and the equilibrium of this reaction is described by the equation. 1.7. However, in practice we use simplified version of this equation, called water ionization constant (sometimes called also water ion product) 1.4.
A lightning flash preceding its thunder by one second would be approximately 350 metres (0.22 mi) in distance; a delay of three seconds would indicate a distance of about one kilometer (0.62 mi) (3Ã340 m). A flash preceding thunder by five seconds would indicate a distance of approximately one mile (1.6 km) (5Ã340 m).
&#149 If you can hear thunder, you are within 10 miles (16 kilometers) of a stormand can be struck by lightning. Seek shelter and avoid situations in which you may be vulnerable. &#149 Use the 30-30 rule, when visibility is good and there is nothing obstructing your view of the thunderstorm.