What happens to the roll sulphur is heated to its boiling point and then cooled in cold water ?

On heating the reaction mixture, the sulfur melts and reacts with the iron exothermically to form iron(II) sulfide.

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.