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».
The Causeway. The Lake Pontchartrain Causeway is the longest highway bridge over water in the entire world, spanning 23.9 miles from Metairie on the South Shore to St. Tammany Parish on the North Shore. The original span opened to the public over 40 years ago in 1956 as a two way, two lane bridge.