Reversible and Irreversible changes involving same materials

Melting of Wax

• Melting of wax in a pan is a reversible change.
• When wax (solid form) is heated in a pan.
• It becomes liquid wax (liquid form).
• When this liquid wax cools down .
• It changes into wax again.

Burning of wax

• The burning of a candle is an irreversible change.
• When a candle is burnt.
• Its size changes i.e it becomes small in size.
• When a candle burns it produces Carbon Dioxide,water and Soot.
• These products cannot be turned back into a candle again.
• Thus,this process is an Irreversible process.