Final answer:
The dishwasher installed by the Johnsons has become a fixture, which is an item that becomes part of the real estate after being attached to the property.
Step-by-step explanation:
After the Johnsons purchased and installed a dishwasher into their kitchen cabinets, the item became a fixture. A fixture is an item that was originally personal property but has been attached to the property in such a way that it becomes part of the real estate. This transformation often occurs in residential settings when new homeowners integrate appliances or other elements into their homes, enhancing the overall property value and functionality.