This node can be added to pairs. It prescribes that the temperature field is continuous across the pair. Continuity is only suitable for pairs where the boundaries match.

If this node is selected from the Pairs menu, select the pairs on which to apply this condition by clicking the Add button () and choose the pairs to add from the list in the Add dialog box that opens; then click OK. A pair has to be created first. See Identity and Contact Pairs for more details.

Physics Tab with interface as Heat Transfer in Solids, Heat Transfer in Fluids, or Heat Transfer in Solids and Fluids selected: