What does W mean in flour?

What does W mean in flour? What is flour strength or W Index? Flour “strength” indicates the strength of the dough and its resistance to leavening. Therefore the higher the W index (e.g. W=180) the longer the leavening time. The strength of flour is measured using a Chopin Alveograph.

What is flour strength or W Index? Flour “strength” indicates the strength of the dough and its resistance to leavening. Therefore the higher the W index (e.g. W=180) the longer the leavening time. The strength of flour is measured using a Chopin Alveograph.