This extreme unit of temperature represents one quadrillion kelvins (10¹⁵ K). It is a theoretical scale used exclusively in high-energy astrophysics and cosmology to describe the thermal state of the universe fractions of a second after the Big Bang. At these temperatures, normal matter cannot exist and fundamental forces begin to unify.
Heard on the job
The quark-gluon plasma models suggest the early universe peaked well above a petakelvin.