Vapor pressure 9.9 x 10-18 mm Hg. 23. 24 KI crystallizes in the sodium chloride structure, hexahedral crystals. It is less hygroscopic than sodium. 25 iodide, making it easier to work with. Potassium iodide is stable in dry air but slightly hygroscopic in. 26 moist air.
Earlier this year China opened the Quindao Haiwan Bridge, the world's longest bridge over water stretching 26.4 miles. With the opening of the Quindao Haiwan, Louisiana's Lake Pontchartrain Bridge fell to second longest after holding the top spot since it opened in 1956. Click here to see the bridges > Â».
1. Danyang Kunshan Grand Bridge â 164,800 meters. The Danyang Kunshan Grand Bridge is, by far, the longest bridge in the world. Its length difference to the second longest bridge in the world is enough to make it the fifth longest bridge in the world. It is a viaduct completed in 2010 to serve train traffic.