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».
China is already home to seven of the world's 10 lengthiest bridges, including the world's longest, the 102-mile Danyang-Kunshan rail bridge, which runs over land and water near Shanghai. 102.4 miles: DanyangâKunshan Grand Bridge, China (rail) 70.6 miles: Tianjin Grand Bridge, China (rail)