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).
Counting the seconds between the strike and the arrival of the thunder and dividing the number of seconds by five gives us a rough estimate of the distance to the strike in miles (dividing by three for a distance in kilometers). So, in the example above, the strike would have been about 1.4 miles (about 2.3 km) away.