Measurement of the Viscosity, Density, and Electrical Conductivity of 1-Hexyl-3-methylimidazolium Bis(trifluorosulfonyl)imide at Temperatures between (288 and 433) K and Pressures below 50 MPa Kandil, M.E.; Marsh, K.N.; Goodwin, A.R.H.; Journal of Chemical & Engineering Data 2007, 52, 2382-2387