However, because 'Furo' is originally a term used to refer to a sauna bath and its original form was 'Muro,' which is a space filled with water vapor, the relationship between the cause and the result seems to have been reversed in this view.
ただし「風呂」とは本来、サウナ風呂のことを指し、蒸気を満たした「室（むろ）」が語源であることを考えると、上の説は前後が逆転している。