Solid sulfur is placed in a beaker and then heated in a bunsen burner flame. As the solid is heated, it begins to melt and a reddish brown liquid forms.
As molten sulfur is heated to 180 degrees Celsius, the free-flowing liquid thickens and becomes very viscous.
When viscous molten sulfur is heated to 200 degrees Celsius, more S-S bonds break and the sample is able to flow.
The electrical conductivity apparatus circuit is completed by distilled water, a liquid covalent compound.