Change of state

17.1 Changes That Occur During a Change of State

A substances changes its state when it gains heat or losses heat. Color, Shape, volume and texture are some of the physical properties that can change during a change of state.

Some example of change of state around us are:

Hardening of wax

                                                                        Drying of water puddles

Melting of butter

17.2 Changes Of State In Water

                                                          Melting

                        Melting                                  

                   Ice------->Water

                     (heat gain)

 

 Boiling                        Boiling

                            Water------>Steam

                                  (heat gain)

                     Evaporation
 

 Water------>Water Vapour

      (Heat Gain)                                       

Change of State when water loses heat

Freezing                      
                             Water------>Ice
                                 (Heat Loss)

               Condensation of Water Vapour

                

               Water Vapour------>Water

                                  (Heat Loss)

                                                      

Condensation of  Steam
              Steam------>Water

                    (Heat loss)

                         Thank you for Seeing Change of State