Аннотация:By using the integral version of Knudsen’s effusion method, the temperature dependences of liquid and solid nickel vapour pressures within the temperature range from 1273 to 1802 K are determined. The appropriate equations of regression are given. The enthalpy of nickel sublimation at 298.15 K is calculated, equalling to 424.5±2.0 kJ/mol with allowance for the errors of thermodynamic functions.