Dynamic viscosity of liquid potassium at different temperatures Junjie Chen Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: komcjj@gmail.com Potassium metal is soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity. Potassium imparts a lavender colour to a flame, and its vapour is green. The potassium content of the Dead Sea is estimated at approximately 1.7 percent potassium chloride, and many other salty bodies of water are rich in potassium. The waste liquors from certain saltworks may contain up to 40 grams per litre of potassium chloride and are used as a source of potassium. Most potassium is present in igneous rocks, shale, and sediment in minerals such as muscovite and orthoclase feldspar that are insoluble in water; this makes potassium difficult to obtain. As a result, most commercial potassium compounds are obtained via electrolysis from soluble potassium compounds, such as carnallite, sylvite, polyhalite, and langbeinite, which are found in ancient lake beds and seabeds. Potassium is produced by sodium reduction of molten potassium chloride. Molten potassium chloride is continuously fed into a packed distillation column while sodium vapour is passed up through the column. By condensation of the more volatile potassium at the top of the distillation tower. Efforts to devise a scheme for commercial electrolytic production of potassium have been unsuccessful because there are few salt additives that can reduce the melting point of potassium chloride to temperatures where electrolysis is efficient. There is little commercial demand for potassium metal itself, and most of it is converted by direct combustion in dry air to potassium superoxide, which is used in respiratory equipment because it liberates oxygen and removes carbon dioxide and water vapour. Temperature (degrees Celsius), Dynamic viscosity (grams per meter per second) 100 0.441 150 0.358 200 0.303 250 0.263 300 0.234 350 0.211 400 0.193 450 0.178 500 0.166 550 0.155 600 0.146 650 0.138 700 0.132 750 0.126 800 0.12 850 0.115 900 0.111 950 0.107 1000 0.104 1050 0.101 1100 0.098 1150 0.095 1200 0.092 1250 0.09 1300 0.088 1350 0.086 1400 0.084 1450 0.082 1500 0.081 1550 0.079 1600 0.078 1650 0.076 1700 0.075 1750 0.074 Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: komcjj@gmail.com, Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China

Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: komcjj@gmail.com, Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China