Foam

A foam is gas held in a film. Egg white, a sauce you aerate, and bread crumb are cousins, not twins. An Emulsion holds oil in water (or the reverse). A foam holds bubbles. Meringue temperature depends on the formula, oven, and intended texture.

Egg as a legal product, then as a whisk #

U.S. standards in 21 CFR Part 160 cover dried, frozen, and liquid egg products; the same part states that no identity standard shall be promulgated for shell eggs as such ¹. Cooks still whisk whites. The kitchen substance is Egg. What you can source here is the product class, not a lab name for the protein that stretches around air.

Observe: volume, gloss, and whether the foam still flows or cuts. Fat on the bowl — yolk, grease — is the usual kitchen failure; the foam stays liquid. Over-whipping turns glossy peaks grainy and weeps. Those are observations, not unsourced chemistry trivia.

Heat then sets the protein around the bubbles — Heat coagulation — or the foam collapses as Water drains. A soufflé’s doneness is a texture cue, while any safety temperature must come from the food and process involved.

Bread crumb is gas in gluten #

Gluten holds fermentation gas. Calvel’s bread is judged as crumb and crust, not as a mixer setting ². King Arthur: early steam lets the loaf expand before the crust locks; that is how you get lofty height and open crumb on a hearth loaf ³. A tight crumb is often bulk or steam, not a missing whisk.

Look at a cut loaf: even holes, tunnels, or paste. Feel whether the walls of those holes are tender or thick. Baking the loaf is when the foam of dough becomes bread.

Action: keep fat out of egg foams; keep gas in dough by not degassing at the wrong moment. Protein is the film: Protein.