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 Bread in Europe Bread is a staple food throughout Europe. Throughout the 20th century, there was a huge increase in global production, mainly due to a rise in available, developed land throughout Europe, North America and Africa. In the Czech Republic, various kinds of bread are made, all sourdough, the differences depending mainly on the type of flour used. Loaves sold in supermarkets are not packed, however, when the loaves are being sold cut in half, shops are required to wrap them in a plastic bag. Non-sourdough sliced bread is called "toustový chléb" (toast bread) and is used only for