A salt (i.e., ionic compound) in the molten state. Halides and nitrates are the salts most commonly used. High temperatures (500–1000C for the alkali halides) are usually required. Most fused salts are liquids with viscosities, diffusion coefficients, thermal conductivities, and surface tensions in the same range as water. They conduct electricity exceptionally well.
Use:
Production of sodium by electrolysis, heat transfer agents, reaction medium in chemical synthesis, heat-treatment of metals (from 350 to 2400F), solvents for the metals corresponding totheir cations, nuclear power reactors.