Pitch change between piano keys?

[no-named]

Does anyone know how much the pitch changes for each note/key on the piano?

Thanks.

EDIT:
Oh look after 2 minutes, 2 people rated me dumb for no reason.

[One Long Sausag]

[url]http://www.phy.mtu.edu/~suits/notefreqs.html[/url]

there you go

[editline]04:23PM[/editline]

you do the maths

[Tezza1234]

One semitone... -_-
I.E: It's logarithmic