Eli5: why do so many baking recipes require milk and butter are they not essentially the same thing chemically?

Question

Eli5: why do so many baking recipes require milk and butter are they not essentially the same thing chemically?

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Answer 1

Not necessarily. Butter is made from the fat content in raw milk. But the milk that you drink regularly, the milk you buy in stores, has had the majority of the fat removed from it. The “full fat” milk you buy in the store has still only a small percentage of that original milk fat remaining.

But likewise, many recipes are also concerned about the moisture level of the ingredients, and their consistency. When cooking, you will get different results depending on how moist your ingredients are, or how much fat you are including it in the recipe.