31. When it crosses the A 4 critical temperature , it changes into delta iron, which is magnetic. 32. The material is heated up to a temperature just below the lower critical temperature of steel. 33. For temperatures below this critical temperature , the above equation for the particle number has no solution. 34. It is widely believed that the critical exponents are the same above and below the critical temperature . 35. At a critical temperature , the symmetry is spontaneously broken, and the W and Z bosons acquire masses. 36. Therefore, this integral defines the critical temperature and particle number corresponding to the conditions of negligible chemical potential. 37. In either case, a superconductor with critical temperature higher than that of the operating temperature should be chosen. 38. Magnetic field lines, represented as arrows, are excluded from a superconductor when it is below its critical temperature . 39. In general their critical temperature at which they become superconducting rises for the first few members then falls. 40. All the parylenes have a critical temperature called the threshold temperature above which practically no deposition is observed.
