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          龍巖協(xié)亞機(jī)械設(shè)備有限公司>>技術(shù)文章>>空氣密度和溫度的對應(yīng)表

          空氣密度和溫度的對應(yīng)表

          閱讀:28148        發(fā)布時(shí)間:2021-5-7

          空氣的溫度對應(yīng)密度表

          空氣溫度       干空氣密度       飽和空氣密度 

                             kg/m3                kg/m3 

          -20                 1.396                  1.395 

          -19                 1.394                  1.393 

          -18                 1.385                  1.384 

          -17                 1.379                  1.378 

          -16                 1.374                  1.373  

          -15                 1.368                  1.367 

          -14                 1.363                  1.362 

          -13                 1.358                  1.357 

          -12                 1.353                  1.352 

          -11                 1.348                  1.347 

          -10                 1.342                  1.341 

          -9                   1.337                  1.336 

          -8                   1.332                  1.331  

          -7                   1.327                  1.325 

          -6                   1.322                  1.32 

          -5                   1.317                  1.315 

          -4                   1.312                  1.31 

          -3                   1.308                  1.306 

          -2                   1.303                  1.301 

          -1                   1.298                  1.295 

          0                    1.293                  1.29 

          1                    1.288                  1.285 

          2                    1.284                  1.281 

          3                    1.279                  1.275 

          4                    1.275                  1.271 

          5                    1.27                    1.266 

          6                    1.265                  1.261 

          7                    1.261                  1.256 

          8                    1.256                  1.251 

          9                    1.252                  1.247 

          10                  1.248                  1.242 

          11                  1.243                  1.237 

          12                  1.239                  1.232 

          13                  1.235                  1.228 

          14                  1.23                    1.223 

          15                  1.226                  1.218 

          16                  1.222                  1.214 

          17                  1.217                  1.208 

          18                  1.213                  1.204 

          19                  1.209                  1.2 

          20                  1.205                  1.195 

          21                  1.201                  1.19 

          22                  1.197                  1.185 

          23                  1.193                  1.181 

          24                  1.189                  1.176 

          25                  1.185                  1.171 

          26                  1.181                  1.166 

          27                  1.177                  1.161 

          28                  1.173                  1.156 

          29                   1.169                 1.151 

          30                   1.165                 1.146  

          31                   1.161                 1.141 

          32                   1.157                 1.136 

          33                   1.154                 1.131 

          34                   1.15                   1.126 

          35                   1.146                 1.121 

          36                   1.142                 1.116 

          37                   1.139                 1.111 

          38                   1.135                 1.107 

          39                   1.132                 1.102 

          40                   1.128                 1.097 

          41                   1.124                 1.091 

          42                   1.121                 1.086 

          43                   1.117                 1.081 

          44                   1.114                 1.076 

          45                   1.11                   1.07 

          46                   1.107                 1.065 

          47                   1.103                 1.059 

          48                   1.1                     1.054 

          49                   1.096                  1.048 

          50-54              1.093                  1.043 

          55-59              1.076                  1.013 

          60-64              1.06                    0.981 

          65-69              1.044                  0.946 

          70-74              1.029                  0.909 

          75-79              1.014                  0.868 

          80-84              1                        0.823 

          85-89              0.986                  0.773 

          90-94              0.973                  0.718 

          95-99              0.959                  0.656 

          100                 0.947                  0.589 

          單位體積空氣所具有的質(zhì)量稱為空氣的密度,用ρ來表示。即:

                                              2-1

          式中  ρ——空氣的密度,kg/m3

               M——空氣的質(zhì)量,m;

               V——空氣的體積,m3。

          一般來說,空氣的密度是隨溫度、濕度和壓力的變化而變化的。在標(biāo)準(zhǔn)大氣狀況下(P101325PatO℃,O%),干空氣的密度為1.293 kg/m3。濕空氣密度的計(jì)算公式為:

                         ρ濕=0.00348410.378           (2-2)

          式中  P——空氣的壓力,Pa

                T——熱力學(xué)溫度(T273+t),K

                t ——空氣的溫度,℃;

               ——相對濕度,%;     

               P飽——溫度為t(℃)時(shí)的飽和水蒸氣壓力(見表1-9),pa

          由上式可見,壓力越大,溫度越低,空氣密度越大。當(dāng)壓力和溫度一定時(shí),濕空氣的密度總是小于干空氣的密度。

          在礦井通風(fēng)中,由于通風(fēng)系統(tǒng)內(nèi)的空氣溫度、濕度、壓力各有不同,空氣的密度也有所變化,但變化范圍有限。在研究空氣流動規(guī)律時(shí),要根據(jù)具體情況考慮是否忽略這種變化。

              一般將空氣壓力為101325Pa,溫度為20℃,相對濕度為60%的礦井空氣稱為標(biāo)準(zhǔn)礦井空氣,其密度為1.2kg/m3

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