Question

A fuel is a substance that can be used to produce heat at a reasonabl cost.. A fuel has veryignition temperature is dangerous to store.. A good fuel should burn at arate and its combustion should be. Fossil fuels are non-renewable because they takemillion of years to form. . The outermost zone of the candle flame is called. Gobar gas is produced byof cow dung by anaerobic bacteria present in cow dung. A better fuel leaves less residue after combustion.zone.​

Answer 1

A fuel is a substance that can produce heat at a reasonable cost. Fossil fuels are non-renewable because they take millions of years to form. Gobar gas, produced by anaerobic bacteria in cow dung, is a renewable fuel that leaves less residue after combustion.

Step-by-step explanation:

A fuel is a substance that can be used to produce heat at a reasonable cost. A good fuel should have a low ignition temperature and burn at a steady rate with complete combustion. Fossil fuels, such as coal, petroleum, and natural gas, are examples of non-renewable fuels because they take millions of years to form and cannot be replaced as fast as they are consumed.

Gobar gas, produced by the anaerobic bacteria present in cow dung, is a renewable fuel that leaves less residue after combustion. The outermost zone of a candle flame is called the blue zone, where complete combustion occurs.