The term 'colorless gas' can refer to several different gases, including ethene (6 letters), ARGON (5 letters), RADON (5 letters), propane (7 letters), ethane (6 letters), XENON (5 letters), and oxan (4 letters). Ethene is a hydrocarbon gas that is used in the production of plastics and other materials. ARGON is an inert gas that is used in welding and other industrial processes. RADON is a radioactive gas that is found naturally in the environment and can be hazardous to human health. Propane is a flammable gas that is used as a fuel source for heating and cooking. Ethane is a hydrocarbon gas that is used in the production of ethylene. XENON is an inert gas that is used in lighting and medical imaging. Oxan is a colorless gas that is used in the production of organic compounds.