9. Do all the substances catch fire on same temperature?

No, not all substances catch fire at the same temperature. The temperature at which a substance catches fire and sustains combustion is known as its ignition temperature or kindling point. The ignition temperature varies widely among different materials due to differences in their chemical composition and physical properties.

Some materials have low ignition temperatures and can catch fire easily, while others require higher temperatures to ignite. For example:

1. Flammable Liquids:

   • Substances like gasoline and alcohol have relatively low ignition temperatures, and they can catch fire easily at or near room temperature.

2. Flammable Solids:

   • Materials like paper, wood, and certain fabrics have ignition temperatures that are generally lower than those of non-flammable materials. They can catch fire at moderate temperatures.

3. Metals:

   • Metals, in general, have high ignition temperatures. They often require extremely high temperatures for combustion. Instead of catching fire, metals may melt or oxidize under certain conditions.

4. Non-Flammable Materials:

   • Some materials, such as rocks, glass, and certain ceramics, are non-flammable and do not have a distinct ignition temperature under normal conditions.

It's important to note that the ignition temperature is not the only factor influencing whether a substance will catch fire. Other factors, such as the presence of oxygen, the concentration of flammable gases or vapors, and the availability of an ignition source, also play crucial roles in determining flammability.

Understanding the flammability characteristics of materials is essential for fire safety and prevention. Fire codes and safety regulations often take into account the properties of different materials to ensure that appropriate precautions are in place to minimize the risk of fires.