1. A device for ground freezing, comprisinga freezing lance which extends along a longitudinal axis and is designed to be introduced into the earth for the purpose of freezing the ground, wherein the freezing lance includes a pipe mantle that encloses an interior space having a first section for holding a liquid refrigerant, wherein the ground surrounding the freezing lance can be cooled by the refrigerant present in the first section,
a line protruding into the interior space for supplying the liquid refrigerant into the first section of the interior space,
wherein the device has a first end section, on which a first opening is provided for removing an exhaust gas, formed by evaporation of the refrigerant, from the interior space, and
wherein the interior space has a second section adjacent to the first section along the longitudinal axis to hold the exhaust gas, so that the exhaust gas can come into contact with the pipe mantle in the second section, wherein a first device for temperature measurement of the exhaust gas is positioned at a transition area between the first section and the second section and said first device for temperature measurement is used to control or regulate inflow of liquid refrigerant into the interior space.