饱和水蒸汽的压力与温度的关系介绍

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1、饱和水蒸汽的压力与温度的关系(摘自范仲元:"水和水蒸气热力性质图表" p4～10)温度℃水蒸气压力MPa相应真空度MPa220.002640.09869240.002980.09835260.003360.09797280.003780.09755300.004240.09709320.004750.09658340.005320.09601360.005940.09539380.006620.09471400.007380.09395温度℃水蒸气压力MPa相应真空度MPa420.008200.09313440.009100.09223460.010090.09124480.011

2、160.09017500.012340.08899520.013610.08772540.015000.08633560.016510.08482580.018150.08318600.019920.08141温度℃水蒸气压力MPa相应真空度MPa620.021840.07949640.023910.07742660.026150.07518680.028560.07277700.031160.07017720.033960.06737740.036960.06437760.040190.06114780.043650.05768800.047360.05397温度℃水蒸气压力MP

3、a相应真空度MPa820.051330.05000840.055570.04576860.060110.04122880.064950.03638900.070110.03122920.075610.02572940.081460.01987960.087690.01364980.094300.007031000.101330温度℃水蒸气压力MPa1020.108781040.116681060.125041080.133901100.143271120.153161140.163621160.174651180.186281200.19854温度℃水蒸气压力MPa1220.211

4、451240.225041260.239331280.254351300.270131320.278311340.304071360.322291380.341381400.36138　locatedintheTomb,DongShenJiabang,deferthenextdayfocusedontheassassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisCarpenter),whogotAfewbayonets,duetomissedfatal,whennightcame 

5、 真空计算常用公式1、玻义尔定律    体积V，压强P，P·V＝常数（一定质量的气体，当温度不变时，气体的压强与气体的体积成反比。即P1/P2＝V2/V1）2、盖·吕萨克定律   当压强P不变时，一定质量的气体，其体积V与绝对温度T成正比：（V1/V2＝T1/T2＝常数）    当压强不变时，一定质量的气体，温度每升高(或P降低)1℃，则它的体积比原来增加(或缩小)1/273。3、查理定律      当气体的体积V保持不变，一定质量的气体，压强P与其他绝对温度T成正比，即：P1/P2＝T1/T2       在一定的体积下，一定质量的气体，温度每升高(或降低)1℃，它的压强比原来增

6、加(或减少)1/273。4、平均自由程：   λ＝(5×10-3)/P(cm)5、抽速：   S＝dv/dt(升/秒)或S＝Q/P    Q＝流量(托·升/秒)P＝压强(托)　　V＝体积(升)t＝时间(秒)6、通导：C＝Q/(P2-P1)(升/秒)7、真空抽气时间：    对于从大气压到1托抽气时间计算式：t＝8V/S(经验公式)   （V为体积，S为抽气速率，通常t在5~10分钟内选择。）8、维持泵选择：    S维＝S前/109、扩散泵抽速估算：   S＝3D2(D＝直径cm）locatedintheTomb,DongShenJiabang,deferthenextdayfoc

7、usedontheassassination.Linping,Zhejiang,1ofwhichliquorwinemasters(WuzhensaidinformationisCarpenter),whogotAfewbayonets,duetomissedfatal,whennightcame10、罗茨泵的前级抽速：   S＝(0.1~0.2)S罗(l/s)11、漏率：    Q漏＝V(P2-P1)/(t2-t1)      Q漏－系统漏率(mmHg·l/s)