humidity 湿度 :
water vapour content in a gas (air) 气体(空气)中水蒸汽含量
• water vapour in the air or in a mixture of gases 水蒸汽在空气或其他混合 气体中
– partial water vapour pressure 水汽分压 p w [mbar]
– relative humidity 相对湿度 rh [%rh]
– dewpoint 露点 t d [ ° c]
– absolute humidity 绝对湿度 a [g/m 3 ]
– mixing ratio 混合率 x [g/kg (d.a.), %] moisture 含水量 :
• water bound in materials 物质中含水量
– moisture content 含水量 w [kg/m 3 ] u [kg/kg dry , %]
– equilibrium relative humidity 平衡相对湿度 erh [%rh]
– water activity 水活性 a w [ ]
relative humidity
相对湿度
relative humidity is the ratio of water vapor pressure present in a gas ( p w ) to the maximum pressure of water vapor that could be present in the gas in that temperature [ p ws (t) ]
相对湿度是在某一温度 ( t) 时 , 气体中所含水蒸汽压力 ( p w ) 与该气体所能包含的最 大水蒸汽压力之比 [ p ws (t) ].
%rh = 100 x p w / p ws (t)
examples 例如 :
relative humidity is strongly proportional to temperature and its measurement is very sensitive to temperature differences.
相对湿度和温度有非常强的关联性 , 相对湿度的测量 对温度的变化非常敏感
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