Final answer:
Adhesion best describes the concept that the consideration is not equal in contract law.
Step-by-step explanation:
The best option that describes the concept that the consideration is not equal in contract law is Adhesion. Adhesion refers to a contract where one party has significantly more power than the other and dictates the terms of the agreement. This can result in an unfair advantage for the more powerful party. In the context of physics and chemistry, adhesion refers to the tendency of different substances to stick together. This can involve molecular forces, such as van der Waals forces or chemical bonds, that cause the substances to adhere to each other at the molecular level. Adhesion is a fundamental concept in understanding how materials interact, and it is particularly relevant in fields like materials science and surface chemistry.