Baking bread is rarely viewed as a violent act of structural engineering, but the entire process relies on forcing two inert proteins (glutenin and gliadin) to physically bond through brutal mechanical stress. When flour is hydrated and aggressively kneaded, these proteins link together to form an immense, elastic microscopic web: Gluten. This technical culinary book bypasses recipes to focus entirely on the microscopic physics of dough. The gluten network is an architectural scaffold built for one specific purpose: to trap exploding gas. As yeast eats sugar, it burps out carbon dioxide. If the gluten web is too weak, the gas escapes and the bread is flat. If the web is perfectly developed, it stretches like a balloon, trapping billions of microscopic gas bubbles, creating the airy crumb structure of the perfect loaf. We analyze the thermodynamics of the oven spring, where heat forces the trapped gas to violently expand just before the proteins coagulate into solid, permanent architecture. Master the molecular science of the kitchen. Understand the incredible physics required to stretch microscopic proteins into a web strong enough to catch air.