21. This critical temperature is 1000K ( 727 �C, 1340 �F ) in plain carbon steels. 22. The temperature gradient in the plate would be equal to the so-called critical temperature gradient. 23. Therefore, close to the critical temperature , solubility often drops with increasing temperature, then rises again. 24. Are materials that are characterized by perfect conductivity below a critical temperature and magnetic field. 25. Indeed, the critical temperature proved to be only 180 �C, 50 �C lower than believed. 26. Below the critical temperature , the van der Waals equation seems to predict qualitatively incorrect relationships. 27. Several members of the group of heavy fermion materials, become superconducting below a critical temperature . 28. Other type-II examples are the cuprate-perovskite ceramic materials which have achieved the highest superconducting critical temperatures . 29. At the beginning, explosive boiling was used by Martynyuk to calculate the critical temperature of metals. 30. To remain a liquid, the vessel contents must be kept at or below its critical temperature .
