[{"from": "human", "value": "Provide a brief overview of this molecule. [C][=O]"}, {"from": "gpt", "value": "The molecule appears as a colorless aqueous solution of formaldehyde, which is a gas at ordinary conditions. Has a pungent irritating odor. Flash point varies from 122 to 141 \u00b0F. Denser than water. The vapors are heavier than air and are highly irritating to the nose. Toxic if swallowed. Contact can cause severe injury to the skin accompanied by drying, cracking, and scaling. Used to make plastics, other chemicals, and fertilizers. Used as a preservative and a corrosion inhibitor.   Rate of onset: Immediate  Persistence: Hours  Odor threshold: 1 ppm  Source/use/other hazard: Disinfection/germicide; fungicide; textile; health care (tissue fixing)."}]