Here's what happens to the state of sulfur as the temperature increases from 20°C to 100°C:

* 20°C: At this temperature, sulfur exists as a solid. It's a brittle, yellow solid known as rhombic sulfur.

* 95.5°C: As you heat sulfur, it remains solid until it reaches its transition temperature. At 95.5°C, rhombic sulfur transforms into another solid form called monoclinic sulfur. Monoclinic sulfur has a needle-like crystal structure.

* 112.8°C: This is the melting point of sulfur. At this temperature, it transitions from a solid (monoclinic) to a liquid.

* 100°C: Since 100°C falls below the melting point, sulfur will still be in its solid state (monoclinic) at this temperature.

Important Note: The transition between rhombic and monoclinic sulfur is slow. Therefore, at temperatures between 20°C and 95.5°C, you will mostly find sulfur in its rhombic form.

Let me know if you'd like to know more about the properties of sulfur at different temperatures!