despite giving heat, heat does not spread from one end to the other.
Answers
Answer:
If heat does not spread from one end to the other, then the substance is poor conductor of heat.
Explanation:
How much heat is required to ignite forest fuels? Vegetative material such as forest fuels ignites at relatively low temperatures provided the amount of moisture in the fuel is low and it is exposed to the air so that sufficient oxygen is available. Actual heat requirements for ignition of dead forest fuels varies from about 500� to 750� F. Many common ignition sources will provide enough heat including a burning match and even a glowing cigarette when in contact with fine fuels that are dry.
IGNITION TEMPERATURE FOR DRY FOREST FUELS = 500� - 750� F.
We know of many methods where heat can be applied to forest fuels to start the combustion process; but how is the process continued? A fire spreads by transferring heat energy in three ways: Radiation, Convection, and Conduction.
Radiation
Radiation refers to the emission of energy in rays or waves. Heat moves through space as energy waves. It is the type of heat one feels when sitting in front of a fireplace or around a campfire. It travels in straight lines at the speed of light. This is the reason that when facing the fire, only the front is warmed. The backside is not warmed until the person turns around. The earth is heated by the sun through radiation. Sunburns are a �fact of life� when people are exposed to the sun very long. Most of the preheating of fuels ahead of a fire is by radiation of heat from the fire. As the fire front gets closer, the amount of radiant heat received is increased.
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