Question

What happens when gypsum is heated above 393 kelvin?

Answer 1

when gypsum is heated above 393 Kelvin it becomes to plaster of paris

Answer 2

If heated with any other agents, it depends on the kind of chemical reaction that might occur with CaSO4. The gypsum gets converted to Plaster of Paris at 373 K. Gypsum is plaster of paris. when it is heated it will melt.