Steam (gaseous water) reacts with carbon at high temperatures to produce carbon monoxide and hydrogen gases.

law of conservation of matter

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".