Question

Egg solidifies when heated. Does this not violate the law of thermodynamics? Third law?

heat is given from surroundings to the system (the egg) and the entropy of system decreases as the system solidifies.

Answer 1

Cooking the egg is when the system is taking in heat, and does lots of fun reactions, the solidification is happening as the heat leaves the system. Like any type of crystallization the entropy decreases as this happens.

Answer 2

as far as my knowledge goes, its denaturation of the protein happening there. the secondary and tertiary structure of the protein breaks apart this results in the solidification.

the thing that bothers me a bit is is it not in violation of entropy increasing law?

Answer 3

Generally, the way that the colloid is acting under heat is dependent upon the system. In this case, the breakdown of the various proteins can allow for structures to form and as heat leaves the system, these are crystallised into the final shape.

In the case of non-newtonian fluids, which are almost always colloids, things can get a bit odd in the entropy world. check this video (they are using cornstarch and water colloid as the fluid)

https://www.youtube.com/watch?v=G1Op_1yG6lQ

The introduction of any force for these can make them into shapes, and then move out when the force is dissipated. Heating them can cause similar, difficult to understand systems.