Combustible materials are those that can catch fire and burn easily. However, for a fire to occur, certain conditions need to be met, including the presence of fuel (combustible material), oxygen, and heat. Ignition temperature is the minimum temperature at which a combustible material can catch fire and continue to burn without the need for an external source of heat or flame.

Explanation:

When a combustible material reaches its ignition temperature, it undergoes a phase change and turns into vapor. This is because the heat causes the molecules of the material to break apart, forming a gas that can ignite and burn. The vaporization process also releases energy that sustains the fire, as the heat generated by the burning material is enough to keep it going.

Some examples of combustible materials that turn into vapor at their ignition temperature include gasoline, propane, and alcohol. These materials are often used as fuels for engines, heaters, and stoves because they are able to burn easily and release a large amount of energy.

It is important to note that not all materials have the same ignition temperature. Some materials, such as paper and wood, have relatively low ignition temperatures and can catch fire easily. Others, such as metals and ceramics, have much higher ignition temperatures and are less likely to ignite.

Conclusion:

In conclusion, at its ignition temperature, a combustible material changes into vapor. This is because the heat causes the molecules of the material to break apart, forming a gas that can ignite and burn. Understanding the ignition temperature of different materials is important for preventing fires and ensuring safety in various settings.