Texas Compressed Natural Gas (CNG) Delivery Truck Driver Practice Exam

CNG, or compressed natural gas, is primarily composed of methane, which is a substance with no measurable flashpoint. The flashpoint is the lowest temperature at which a substance can vaporize to produce an ignitable mix with air. Because CNG exists as a gas at normal atmospheric pressures and temperatures, it does not have a flashpoint in the traditional sense. Instead, it will mix with air and can ignite if there is a spark or sufficient heat present, but it doesn’t have a solid temperature at which it transitions from a non-flammable state to a flammable state like liquids do. Therefore, stating that CNG does not have a flashpoint is accurate and aligns with its physical properties. This distinction is crucial for safe handling and understanding the risks associated with using and transporting CNG.