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».
Fourteen of the 20 longest bridges in the world are in China. The longest outside Asia and the sixth longest in the world is Louisianaâs Lake Pontchartrain Causeway which is 24 miles (38km) long. Still in the US, the San Francisco-Oakland Bay Bridge is the worldâs widest at 78.7m (258ft) across. It has 10 traffic lanes and a cycle lane.