Met with skepticism from materials scientists and superconductor researchers, the most advanced superconductors known prior to this situation had critical temperatures reaching 250 K (-23 °C; -10 °F) under pressures surpassing 170 gigapascals. In contrast, superconductors with the highest critical temperatures under normal atmospheric pressure (1 atm) could only reach a maximum of 150 K (-123 °C; -190 °F).