A whole tone scale is a scale in which each note is separated from its neighbours by the interval of a Maj 2nd or a whole step (whole tone).
the whole tone scale on C
the whole tone scale on B 
The whole tone scale has no leading tone and because all tones are the same distance apart, "no single tone stands out, [and] the scale creates a blurred, indistinct effect. This effect is especially emphasised by the fact that triads built on such scale tones are augmented. Indeed, one can play all six tones of a whole tone scale simply with two augmented triads whose roots are a major second apart. Since they are symmetrical, whole tone scales do not give a strong impression of the tonic or tonality.
