The lowest temperature at which a substance catches fire is called its _______.

The correct answer is ignition temperature.Key Points

• Ignition temperature is the minimum temperature required for a substance to ignite spontaneously and sustain combustion.
• It is also called the auto-ignition temperature.
• This temperature is specific to each substance and depends on its chemical composition, physical state, and surrounding conditions such as pressure and concentration of oxygen.
• The ignition temperature is an important safety parameter for handling and storing flammable substances.
• If the temperature can be kept below the ignition temperature, the substance will not catch fire.

Additional Information

• Melting point is a physical property of a substance that determines its ability to change from solid to liquid state.
  • It is affected by factors such as pressure, purity, and crystal structure.  
• Combustion temperature is a measure of the energy released during the combustion of a substance.
  • It is influenced by factors such as the chemical composition of the substance, the amount of oxygen present, and the heat transfer rate.