grid witdh vs weight

I noticed that the learning path “become a rapid developer” refers to the amount of columns in a grid as the weight, but the docs refer to it as width.   I was wondering if this was on purpose and if so what the difference is. Not a high priority question of course, I was just curious.
1 answers

It is on purpose. The weight is also the name of the property of a layout grid’s column:

The weight is the width compared to the widht of the window that the layout grid is in. 12 being the entire width, 1 being one-twelfth of the width.

The ‘width’ is the exact amount of pixels.