An example of this is a change in the wake or a puff of smoke.
Kowuphi umgama ongsemva wenye inqanawa apho kufuneka inqanawa enesantya inciphise isantya sibe ziinothi eziyi12? Ukuvumela i50 yeeyadi zeenothi, inqanawa enesantya kufuneka inciphise ukuya kwiinothi eziyi12 kwi [(20 - 12) x 50] + 60 = 1,000 yeeyadi.