Final answer:
The condensation process in a copper tube occurs when steam is cooled and converted into liquid water by coming into contact with the cool copper surface.
Step-by-step explanation:
The condensation process in a copper tube occurs when steam, which is in its gaseous form, is cooled and converted into liquid water. In this case, the copper tube acts as a cooling surface for the steam. As the steam comes into contact with the cool copper tube, it loses heat to the tube and undergoes a phase change from gas to liquid. This is because the attractions between water molecules become strong enough to hold them together.