Question

what is the next condition of melted candle ?explain it ​

Answer 1

Candle combustion is irreversible, wax melting is reversible. When you burn a candle, you end up with less wax after burning than you started with. This is because the wax oxidizes, or burns, in the flame to yield water and carbon dioxide, which dissipate in the air around the candle in a reaction that also yields light and heat. Candle Wax Combustion
Candle wax, also called paraffin, is composed of chains of connected carbon atoms surrounded by hydrogen atoms. These hydrocarbon molecules can burn completely. When you light a candle, wax near the wick melts into a liquid.

The heat of the flame vaporizes the wax molecules and they react with the oxygen in the air. As wax is consumed, capillary action draws more liquid wax along the wick. As long as the wax doesn't melt away from the flame, the flame will consume it completely and leave no ash or wax residue. Both light and heat are radiated in all directions from a candle flame. About one-quarter of the energy from combustion is emitted as heat. The heat maintains the reaction, vaporizing wax so that it can burn, melting it to maintain the supply of fuel. The reaction ends when there is either no more fuel (wax) or when there isn't enough heat to melt the wax.