This is the 9372nd most frequent German word.
mehl
Flour.
Here, 'Mehl' is described in the context of quantity and supply.
Der Bäcker hat gestern drei Säcke Mehl geliefert.
The baker delivered three sacks of flour yesterday.
Here, 'Mehl' is used as a noun to refer to the ingredient 'flour'.
Ich habe Mehl gekauft, um einen Kuchen zu backen.
I bought flour to bake a cake.
In this sentence, 'Mehl' represents the general concept of different types of flour.