Translations:AY Honors/Cooking/Answer Key/59/en
From Pathfinder Wiki
Cracking of eggs while cooking is caused by the too rapid expansion of pressure in the air pocket inside the egg. Eggshell is porous and will allow the air to escape as the egg heats and its contents expand. However if the egg heats too quickly the air does not have time to escape. This causes an uneven pressure on the inside of the shell as the air pocket heats at a different rate than the white. The egg then cracks, often leaking into the cooking water.
