Previous research suggests that along with the initial
air incorporation, final cake density also depends on the stability of air
bubble during baking As the oven is heated up, bubbles
tend to migrate and expand,while lipid crystals (adsorbed to the air
bubbles during mixing) melt they form a uniform layer over the inner
surface of the bubble, allowing bubble expansion without rupture
(Brooker, 1993; Zhou et al., 2011) resulting in a stable bubble in the
final cake