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        Walls of Glass

        In this video from NOVA, learn how glass is used in the architectural design of One World Trade Center. The skyscraper uses 12,000 glass panels cased in aluminum in a design called a “curtain wall.” Despite its appearance as a weak building material, each glass panel in this curtain wall can withstand thousands of pounds of pressure. Adding to the safety of the building is a new type of polyurethane coating applied between two pieces of glass. When heated, the coating helps to prevent the glass wall from shattering. The coating also ensures that the building stays cool by allowing light to enter while keeping heat out, which reduces the overall cost of electricity.

        This video is available in both English and Spanish audio, along with corresponding closed captions.

        Learn more here.

        Also Available in English | Spanish
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