The egg always has an air pocket on the bottom, at the blunt end. This is an air pocket that the developing chicken embryo uses for gas exchange. See the diagram:
Yes, though the air pocket is there right from the start. If you pierce the bottom of the shell with a pin before boiling then the egg will have less of a dent at the bottom after boiling, giving a more uniform shape.
The egg always has an air pocket on the bottom, at the blunt end. This is an air pocket that the developing chicken embryo uses for gas exchange. See the diagram:
Source: Bird eggs on Wikipedia.
That egg’s more on the balut phase.
https://en.wikipedia.org/wiki/Balut_(food)
Yes, though the air pocket is there right from the start. If you pierce the bottom of the shell with a pin before boiling then the egg will have less of a dent at the bottom after boiling, giving a more uniform shape.
Also removes the pressure when cooking and helps the shell to separate.