饱和蒸汽热焓值表附表18（续）P0.5MP&IMPa=151s=17?91^°C)V*ps'0.0010925640.35 1.8S100.0011272762.842.3188m3/kgkJ/kgkJ/(kgK)m3/kgkJ/kgkJ/(kg-K)hn躬1V'如15"'0.374902743.6 6,82140,151...
附表18（续）P0.5MP&IMPa=151s=17?91^°C)V*ps'0.0010925640.35 1.8S100.0011272762.842.3188m3/kgkJ/kgkJ/(kgK)m3/kgkJ/kgkJ/(kg-K)hn躬1V'如15"'0.374902743.6 6,82140,1514402777.76,5859m\kgkJ/kgkJ/(kgK)n?他gkJ/kgkJ/(kgK)/Cp1冏kJ/kgkJ03.971.52750.0010599504.321.52701400.0010796589.301.73920.0010783589.621.73861600.383582767.26.86470.0011017675.841.94241800.404502811.76.96510.194432777.96.58642000.424872854.97.05850.205902827.36.69312200.444852897.37.14620.216862874.26.79032400.464552939.27.22950.227452919.66.88042600.484042980.87.30910.237792963.86.96502800.503363022.27.38530.247933007.37.04513000.522553063.67.45880.257933050.47.12163500.570123167.07.63190.282473157.07.29994000.617293271.17.79240.306583263.17.46384200.636083312-97.85370.316153305.67.52604400.654833354-97.91350.325683348.27.58664500.664203376.07.94280.330433369.67.61634600.673563397.27.97190.335183390.97.64564800.692263439.68.02890.344653433.87.70335000.710943482.28.08480.354103476.87.75975500.757553589.98.21980.377643585.47.89586000.804083699.68.34910.401093695.78.0259附表18（续）m3/kg00.00099873.010.00000.00099775.040.0002100.000998944.920.15070.000997946.870.1506200.001000586.680.29570.000999688.550.2952400.0010066170.150.57110.0010057171.920.5704600.0010158253.660.82960.0010149255.340.8286800.0010276377.281.07340.0010267338.871.07211000.00104204121.241.30470.0010410422.751.303112010.00105875)05.731.52520.0010576507.141.52341400.00107815)90.921.73660.0010768592.231.73451600.00110026>77.011.94000.0010988678.191.93771800.00112567£4.232.13690.0011240765.252.13422000.00115498152.932.32840.0011529853.752.32532200.0011891943.652.51620.0011867944.212.51252400.0681842823.46.22500.00122661037.32.69762600.0728282884.46.34170.00127511134.32.88292800.0771012940.16.44430.0422282855.86.08643000.0841912992.46.53710.0453012923.36.20643500.0905203114.46.74140.0519323067.46.44774000.0993523230.16.91990.0578043194.96.64464200.1027873275.46.98640.0600333243.66.71594400.1061803320.57.05050.0622163291.56.78404500.1078643343.07.08170.0632913315.26.81704600.1095403365.47.11250.0643583338.86.84944800.1128703410.17.17280.0664693385.66.91255000.1161743454.97.23140.0685523432.26.97355500.1243493566.97.37180.0736643548.07.11876000.1324273679.97.50510.0786753663.97.2553附表16（续）温度压力比体积比焓汽化潜热比熵t'Cp/MPaV'V*1k''Y尸旄tn3/kgkJ陶kJJkgkjr(kg-K)95().0845330.001039611.9827397.982667.732269.71.25017.41541000.1013250.001043441.6736419.062675.712256.61.30697.35451100.1432430.001051561.2106461.332691.262229.91.41867.23861200.1984830.001060310.892195C3.762706.182202.41.52777.12971300.2700180.001069680.66873546.382720.392174.01.63467.02721400.3611900.001079720.50900589.212733.812144.61.73936.93021500.475710.001090460.39286632.282746.35?2114-11.84206.83811600.617660.001101930-3070967七.622757.922082-31.94296.75021700.791470.001114200.24283719.252768.422049.22.04206.66611801.001930.001127320.19403763.222777.742014-52.13966.58521901.254170.001141360.156508C7.562785.801978-22.23586.50712001.553660.001156410.12732852.342792.471940.12.33076.43122101.906170.001172580.10438897.622797.651900.02.42456.35712202.317830.001190000.086157943.462801.20857.72.51756.28462302.795050.001208820.071553989.952803.00813.02.60966.21302403.344590.001229220.05&-7431037.22802.88765.72.70136.14222503.973510.001251450.0501121085.32800.66715-42.79266.07162604.689230.001275790.0421951134.32796.14661.82.88376.00072705.499560.001302620.0356371184.52789.05604.52.97515.9292本表引自严家巧、余晓福编著《水和水蒸汽热力性质图表》，高等教育出版社,1995液体中分子的平均距离比气体中小得多。汽化时分子平均距离加大、体积急剧增大，需克服分子间引力并反抗大气压力作功。因此，汽化要吸热。单位质量液体转变为同温度蒸气时吸收的热量称为汽化潜热，简称汽化热。汽化热随温度升高而减小，因为在较高温度下液体分子具有较大动能，液相与气相差别减小。在临界温度下，物质处于临界态，气相与液相差别消失，汽化热为零。汽化有蒸发和沸腾两种形式。焓是汽体的一个重要状态参数。焓的物理意义为：在某一状态下气体所具有的总能量， 它等于内能和压力势能之和。焓用符号i表示。熵是热力学中的一个导岀参数。熵的微小变化起着有无传热的标志作用。熵的引 入可以方便地反映岀热力过程热量的转换及循环的热效率。在一个微小的热力过程中，如加入热量q,加热时的温度为T,则这个过程的熵值△si=△q/T1。在一个完整的热力过程中的熵值△s=E^si。把热力过程部分得越微小（此时可认为T是一常数）所计算出的熵s值厶s越准确。用积分方法：△s=/dq/T能算出精确结果。 水蒸气的熵值o点定为三相点（273.16开），则任意状态下的熵值便可以计算出来。
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