The ease with which water can be won from air depends on that air's relative humidity.

从空气中获取水分的难易程度取决于空气的相对湿度。

In the hottest room it boosted the relative humidity of inspired air by over 50%, compared with breathing without a mask.

在最热的房间里，戴棉质口罩呼吸与不戴口罩呼吸相比，它使吸入空气的相对湿度提高了50%以上。