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).
Your distance from a thunderstorm can be estimated by measuring the time between seeing the lightning flash and the hearing the start of thunder. The length of this interval in seconds can be divided by three to give an approximate distance in kilometres. Sometimes lightning may be seen but there is no thunder heard.