In quantum mechanics, entanglement is a fundamental phenomenon that can occur between particles, such as electrons, photons, or atoms. When two or more particles become entangled, their quantum states become correlated in a way that the state of one particle cannot be described independently of the others.
However, not all particles in a system are necessarily entangled. Entanglement arises when particles interact or are generated in specific ways that result in their quantum states becoming entangled. If particles do not undergo such interactions or are not generated in entangled states, they remain separate and unentangled.
In fact, most macroscopic objects in our everyday experience, such as tables, chairs, and ordinary materials, do not exhibit entanglement on a noticeable scale. The effects of entanglement become significant in the realm of quantum physics, where particles at the microscopic level or in controlled experimental setups can be intentionally entangled.
It's important to note that the presence or absence of entanglement depends on the context and the system under consideration. While entanglement is a common phenomenon in certain quantum systems, it is not a universal property of all particles or objects.