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. Too early or too late of melting will lead to the loss of air bubble and a denser cake.