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Why Bread Rises in the Oven

Why does bread rise? It starts before the oven: fermentation-generated carbon dioxide gets trapped in dough’s bubble network, creating gas that heat can later enlarge.

  • End of bulk fermentation close up in bowl with bubbles
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Then heat drives oven spring: trapped gases expand, while water turns to steam and ethanol evaporates, adding pressure inside the bubbles.

  • Sourdough bread oven spring
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As bubble pressure rises, gluten’s elastic network stretches. Further heating makes starch gelatinize and gluten proteins coagulate, turning flexible dough into a stable crumb.

  • Sourdough cross-section showing open crumb structure with soft diffused side window light demonstrating bread photography lighting
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As baking continues, water and alcohol evaporate from the loaf. The surface dries and stiffens, forming the crust while the interior loses moisture.

  • Free Detailed close-up of a golden brown bread crust, showcasing its texture and artisanal quality. Stock Photo
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Rising stops when the crust is rigid and starch and gluten have set the crumb, so bubbles cannot expand the loaf further. Yeast also stops producing gas as heat inactivates it.

  • final baked loaves
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