把水放在真空中会怎么样

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1、饱和水蒸气压力饱和水蒸气压力，又称饱和蒸汽压，指密闭条件下水的气相与液相达到平衡即饱和状态下的水蒸气压力。该压力数值与对应的温度有关。饱和水蒸气压力原理当液体在有限的密闭空间中蒸发时，液体分子通过液面进入上面空间，成为蒸汽分子。由于蒸汽分子处于紊乱的热运动之中，它们相互碰撞，并和容器壁以及液面发生碰撞，在和液面碰撞时，有的分子则被液体分子所吸引，而重新返回液体中成为液体分子。开始蒸发时，进入空间的分子数目多于返回液体中分子的数目，随着蒸发的继续进行，空间蒸汽分子的密度不断增大，因而返回液体中的分子数目也增多。当单位时间内进入空间的分子数目与返回液体

2、中的分子数目相等时，则蒸发与凝结处于动平衡状态，这时虽然蒸发和凝结仍在进行，但空间中蒸汽分子的密度不再增大，此时的状态称为饱和状态。在饱和状态下的液体称为饱和液体，其对应的蒸汽是饱和蒸汽。饱和水蒸气压力定义饱和水蒸气压力，指密闭条件下水的气相与液相达到平衡即饱和状态下的水蒸气压力。饱和水蒸气压力数值与饱和温度相关，当温度上升时，对应的饱和水蒸气压力随之上升。饱和水蒸气温度与压力表温度t/℃绝对压强p/kPa水蒸汽密度ρ/kg·m-3焓H/kJ·kg-1汽化热r/kJ·kg-1液体水蒸汽水蒸汽00.610.000.002491.102491.1050

3、.870.0120.942500.802479.86101.230.0141.872510.402468.53151.710.0162.802520.502457.70202.330.0283.742530.102446.30253.170.02104.672539.702435.00304.250.03125.602549.302423.70355.620.04146.542559.002412.10407.380.05167.472568.602401.10459.580.07188.412577.802389.405012.340.08209

4、.342587.402378.105515.740.10230.272596.702366.406019.920.13251.212606.302355.106525.010.16272.142615.502343.107031.160.20293.082624.302331.207538.550.24314.012633.502319.508047.380.29334.942642.302307.808557.880.35355.882651.102295.209070.140.42376.812659.902283.109584.560.503

5、97.752668.702270.50100101.330.60418.682677.002258.40105120.850.70440.032685.002245.40110143.310.83460.972693.402232.00115169.110.96482.322701.302219.00120198.641.12503.672708.902205.20125232.191.30525.022716.402191.80130270.251.49546.382723.902177.60135313.111.72567.732731.002

6、163.30140361.471.96589.082737.702148.70145415.722.24610.852744.402134.00150476.242.54632.212750.702118.50160618.283.25675.752762.902037.10170792.594.11719.292773.302054.001801003.505.15763.252782.502019.301901255.606.38807.642790.101982.402001554.777.84852.012795.501943.502101

7、917.729.57897.232799.301902.502202320.8811.60942.452801.001858.502302798.5913.98988.502800.101811.602403347.9116.761034.562796.801761.802503977.6720.011081.452790.101708.602604693.7523.821128.762780.901651.702705503.9928.271176.912768.301591.402806417.2433.471225.482752.001526

8、.502907443.2939.601274.462732.301457.403008592.9446.931325.54