What is referred to as the 'headspace' in fire investigation?

The term 'headspace' in the context of fire investigation refers specifically to the space inside a sealed container of debris, situated between the top of the container and the lid. This area is significant because it can contain flammable vapors from any volatile substances that might have been present in the debris. During a fire investigation, examining the headspace can provide critical evidence regarding the materials involved in the fire and their potential to ignite. Analyzing these vapors can assist investigators in determining the fire's origin and cause, especially if accelerants were used.

Understanding the headspace and its implications is vital for fire investigators, as it helps them gather and analyze potential evidence effectively. This is particularly important in cases of suspected arson or when trying to ascertain the fire's behavior and spread, as the composition of the vapors can provide valuable insights into what occurred.