HUMIDITY 濕度 :

Water vapour content in a gas (air) 氣體(空氣)中水蒸汽含量

• water vapour in the air or in a mixture of gases 水蒸汽在空氣或其他混合 氣體中

– partial water vapour pressure 水汽分壓 P w [mbar]

– relative humidity 相對濕度 RH [%RH]

– dewpoint 露點 T d [ ° C]

– absolute humidity 絕對濕度 a [g/m 3 ]

– mixing ratio 混合率 x [g/kg (d.a.), %] MOISTURE 含水量 :

• water bound in materials 物質中含水量

– moisture content 含水量 w [kg/m 3 ] u [kg/kg dry , %]

– equilibrium relative humidity 平衡相對濕度 ERH [%RH]

– water activity 水活性 A w [ ]

Relative humidity
相對濕度

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) ]

相對濕度是在某一溫度 ( t) 時 , 氣體中所含水蒸汽壓力 ( P w ) 與該氣體所能包含的最 大水蒸汽壓力之比 [ 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.

相對濕度和溫度有非常強的關聯性 , 相對濕度的測量 對溫度的變化非常敏感