One novel way to retain thermal energy collected by a solar tower is through a mixture of sodium nitrate, potassium nitrate, and calcium nitrate. This method is often referred to as 'molten ______.' What dinner table-sounding word fills in the blank?

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1. One novel way to retain thermal energy collected by a solar tower is through a mixture of sodium nitrate, potassium nitrate, and calcium nitrate. This method is often referred to as 'molten ______.' What dinner table-sounding word fills in the blank?