详细解释:【化】 相对湿度
英语解释：
名词 relative humidity:
the ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature; expressed as a percentage例句：
An instrument designed to indicate or control the relative humidity of the air.恒湿器一种用于显示或控制空气中相对湿度的仪器