Question

Now observe colour of flame of kitchen stove. What is the reason behind difference of colours of both flames? *​

Answer 1

Answer:

Complete burning needs excess air/oxygen. The set up of the gas stove allows for air to mix with gas before burning. The candle doesn't have that mechanism. Incomplete burning gives the yellow coloration.

Explanation:

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Answer 2

Answer:

The color of flame indicates the temperature, type of fuel or the completion of combustion. For example, a blue flame is the hottest flame followed by a yellow flame and then orange and red flames.

• A blue flame indicates the complete combustion of the gas. LPG burns with a blue flame.
• Pure hydrocarbons such as methane, ethane, propane and butane gases also burn with a blue flame.
• A orange, yellow or red flames  indicates that there is incomplete combustion of the gas.
• The yellow or red flames are due to blaze of very fine residue particles which are produced in the flame.
• The temperature of LPG's blue flame around 1,980°C while red flames only burns at around 1000 °C.
• An incomplete combustion of gases  also produce dangerous carbon monoxide.
• The blue of natural gas burns at temperature 1960°C.

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