👉 The origin fluid, also known as primordial fluid, is a theoretical substance that is proposed to have existed in the early universe before the formation of subatomic particles and atoms. According to cosmological models, this fluid is thought to have been composed of various elementary particles, including quarks and leptons, and was in a state of thermal equilibrium with other fundamental forces. As the universe expanded and cooled, this fluid underwent phase transitions, leading to the formation of protons, neutrons, electrons, and photons. The origin fluid's properties, such as its density and composition, are crucial for understanding the subsequent formation of atoms, stars, and galaxies. However, it's important to note that this concept remains speculative, as direct evidence of the origin fluid is not yet available due to the universe's extreme conditions at its inception.