[en] The high-temperature density and electrical conductivity have been studied of a recent composition of simulated nuclear waste glass and some standard glasses. The density was measured using Archimedes' principle by measuring the buoyant force on a platinum sphere of known volume suspended in the melt. The measurement was corrected for the force exerted on the suspending wire by surface tension. The electrical conductivity data obtained by two different methods were compared to determine if calculating the cell constant from the cell geometry or calibrating with a known electrolyte resulted in any significant difference in values