The $\_\_\_\_\_$ in terms of a building, refers to the ability of glass to allow solar radiation in$,$ but not let the heat produced escape. As solar radiation is transmitted through the glass, the energy is absorbed by interior fixtures and fittings $($thermal energy$).$ The thermal energy then leaves these objects to the cooler air in the room to create a balance between warm and cool. When this happens, total thermal energy becomes built up$,$ therefore, resulting in an increase in temperature. The thermal energy is unable to escape from the glass in which it originated, resulting in an overly hot room, much like a greenhouse. fill in the blank