2, preheating the oven is to be able to quickly reach the temperature needed to bake things, not preheating slow warming, difficult to make the cake, bread and other rapid qualitative, baked cake may appear head small, hard taste, cake collapse, the surface is easy to bake scorched and other defects.
3, if you let the temperature rise slowly to the cake will be baked, the cake flow is very forgiving in the surface is not yet dry outward flow, after baking the shape is not as beautiful as we intended.