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
Tunisian bread riots of the state budget. The subsidies favored the wealthy as much as the poor. The decision was announced on 29 December 1983, and led to an immediate rise in the price of bread and flour. Prices went up by over 100%. The increase, the first in fifteen years, directly affected the poor. Some Tunisian families spent 80% of their food budget on bread and semolina. The subsidies were removed at a time of growing political tension. Leftist parties were becoming more popular, as were the Islamist movements, while members of the political elite were jostling for position in anticipation of