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