Bread unpredictable since the steam is not produced until the bread is baked. Steam leavening happens regardless of the raising agents (baking soda, yeast, baking powder, sour dough, beaten egg white) included in the mix. The leavening agent either contains air bubbles or generates carbon dioxide. The heat vaporises the water from the inner surface of the bubbles within the dough. The steam expands and makes the bread rise. This is the main factor in the rising of bread once it has been put in the oven. CO generation, on its own, is too small to account for the rise. Heat
Bread in Europe rise. Another traditional Irish bread is barmbrack, a yeasted bread with added sultanas and raisins, customarily consumed at Halloween. Potato bread is also traditional in Ireland, especially in Ulster. Many new types of bread have reached the markets in Norway in recent years. A high percentage of people reported regularly eating bread types such as spelt, speciality, gourmet, and fibre/bran bread, as well as ciabattas and baguettes, although very few reported doing so on a daily basis. Norwegian bakers now have competition from abroad. The wholegrain bread from local bakers must give way to huge lorry loads of baguettes and