When new particle pairs are being created as fast as they annihilate, it is:
A)hydrostatic equilibrium.
B)thermal equilibrium.
C)the threshold equilibrium.
D)the cosmological constant.
E)the critical density.

Question

Quizplus · Accepted Answer

When new particle pairs are being created as fast as they annihilate, it is called thermal equilibrium. This is a state where the system's temperature remains constant because the rate of energy being lost is balanced by the rate of energy being gained. When new particle pairs are being created as fast as they annihilate, it is known as thermal equilibrium. This state is related to the temperature of the system, where the interaction rate of the particles is balanced with the expansion rate of the universe. It is important in understanding the early universe and the creation of elements.

When New Particle Pairs Are Being Created as Fast as They