“Water vapor” in Japanese
Short answer
Water vapor in Japanese is “水蒸気” (suijouki). Full meaning: water vapour, water vapor, steam.
Other ways to say “Water vapor” in Japanese
水気
suiki water content, moisture, juiciness, dampness; water vapor (vapour), steam; dropsy, edema, oedema
水け
mizuke water content, moisture, juiciness, dampness; water vapor (vapour), steam; dropsy, edema, oedema
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