For the 2021 edition of NFPA 30, the committee introduced a sweeping change in the classification scheme for liquids. The term ignitible liquid has been introduced to initiate a process whereby the terms flammable liquid and combustible liquid are no longer used. This causes the requirements in NFPA 30 and other codes and standards to adopt a scheme based exclusively on the liquid physical state and property (i.e., the liquid flash point), for all liquids that can be ignited. The necessity for this change stems from the existence of multiple regulatory systems that use the terms flammable liquid and combustible liquid inconsistently, leading to confusion in how to apply regulations properly among overlapping regulatory authorities, such as fire officials, occupational safety officials, and transportation officials.