Because if I come into your shop and I want to buy 1 blort of milk, and you never heard of the 'blort' and you only sell milk in buckets of 1 fleschl for 5 zlotys, I would have no idea of how many...
Ingredients (what and amount - how much - TSP, TBS, Cups, Liters, etc.), directions on what to do with it (Mix, freeze, boil, etc.) temperatures (to freeze or bake) as required, Time (to prepare,...