Addition of ferromagnetic particles, hygroscopic water-retaining materials, or other materials can yield a hot melt adhesive which can be activated by microwave heating.
The cathedral was equipped with an independent central heating and a central vacuum cleaning system employing a complex network of pressurized manifolds and valves.
When electricity is generated, the heat that is produced as a by-product can be captured and used for process steam, heating or other industrial purposes.
