The term 'FORCE GAS INTO' can be solved by the crossword solution 'AERATE, ' which is a six-letter word. Aeration is the process of introducing air into a liquid or gas, usually to improve its quality or to increase its oxygen content. It is commonly used in water treatment, wastewater treatment, and soil remediation. In the context of the term 'FORCE GAS INTO, ' aeration would involve forcing a gas into a liquid or another gas, such as oxygen into water or carbon dioxide into air.