沸程测定的计算

1、沸程测定的计算以3月13日取152/A测定沸程为例：测得：初点温度：（主）55.5C；辅；22.0C干点温度：（主）55.8C；辅；40.0C室温：20.8C；大气压力计读数：711.2hpa;计算：沸程温度范围T（C）;T=T2-T1式中：T1-校正到标准状态下干点的温度；T2-校正到标准状态下初点的温度；T=ta+At+t2（初）+At3T2=tb+A11+At2（干）+At3式中;ta一蒸僻时观察到的初僻点，Ctb一蒸僻时观察到的干点，cAt1-主温度计的校正值，C（使用温度计的校正值）t2主温度计水银柱露出塞上部分的校正值，C计算：12（初）=0.00016h1（ta-t2）=0.00

2、016X55.5（55.5-22.0）=0.2974812（干）=0.00016h2（tb-t2）=0.00016X55.8（55.8-40.0）=0.1410624 13=k（101325-P0）;式中：k-气压变化Pa对甲酿沸点温度的校正值101325-标准气压PaP0-试验地点气压换算为0C及45度纬度时的气压，PaPo=PAPi-P2+AP3式中;P-试验地点观测气压，Pa Pi一气压计的校正值，Pa P2一室温时气压换算到0C的气压校正值，PaP3试验地区纬度校正值，Pa,（纬度大于45C为正值，小于45C为负值）=设绝压气压计校正为0.0P2=a据大气压和温度查表B,925hpa2

3、1C，时为3.16;上200hpa为3.58;差值为0.42，那么下降200hpa时，与观察大气压相近；即取3.16-0.42=2.74，即-2.74;?3=根据大气压和温度查表B,925hpa20C，时为-1.92;上200hpa为-2.28;差值为0.36，那么下降200hpa时，与观察大气压相近；即取1.92-0.36=1.56，即-1.56;P0=PAP1-P2+AP3=711.2+0+(-2.72)+(-1.56)=706.9hpaP3=k(101325-P0)=2.78X10-4(101325-706.9)=8.51653(k查表A)Pi查表D50-70C，差得值：0.03;T1=

4、ta+t1+t2(初)+13=55.5+0.03+0.2974+8.51653=64.34393T2=tb+t1+t2(干)+13=55.8+0.03+0.1410624+8.51653=64.48759沸程温度范围：T=T2-Ti=64.48759-64.34393=0.14366表A：物质的沸点随压力的变化率的K值气压Pa773-813814-866867-933934-986987-1066K值C/Pa2.78*10-42.70*10-42.62*10-42.55*10-42.48*10-4气压计读数、纬度、沸程温度随气压变化的校正值表B：给出了纬度校正值。室温C气压表或气压计数器/hp

5、a925950975100010251050107511000-2.48-2.55-2.62-0.69-2.83-2.83-0.90-2.975-2.44-2.51一2.57-2.64-2.77-2.77-2.84-2.9110-2.35-2.41-2.47-2.53-2.65-2.65-2.71-2.7715-2.16-2.22-2.28-2.34-2.45-2.45-2.51-2.5720-1.92-1.97-2.02-2.07-2.17-2.17-2.23-2.2825-1.61-1.66-1.70-1.75-1.84-1.84-1.89-1.9430-1.27-1.30-1.33-1.

6、37-1.44-1.44-1.48-1.5235-0.89-0.91-0.93-0.95-0.99-0.99-1.02-1.0540-0.48-0.49-0.50-0.51-0.53-0.53-0.54-0.5545-0.05-0.05-0.05-0.05-0.05-0.05-0.05-0.5550+0.370.390.400.410.430.440.450.4655+0.790.810.830.860.880.910.930.9560+1.171.201.241.271.300.331.361.3965+1.52+1.56+1.60+1.65+1.69+1.73+1.77+1.8170+1.

7、831.871.921.972.022.072.122.17表C.气压计读数的校正值气压袁或气压计读数/hPa室温C气压表或气压计数器/hpa92595097510001025105010751100101.511.551.591.631.671.711.751.79111.661.701.751.791.841.887.931.97121.811.861.901.952.002.052.102.15131.962.012.062.122.172.222.282.33142.112.162.222.282.342.392.452.51152.262.322.382.442.502.562.63

8、2.69162.412.472.542.602.672.732.802.87172.562.632.702.772.832.902.973.04182.712.782.852.933.003.073.153.22192.862.933.013.093.173.253.323.40203.013.093.173.253.333.423.503.58213.163.243.333.413.503.593.673.76223.313.403.493.583.673.763.853.94233.463.553.653.743.833.934.024.12243.613.713.813.904.004.

9、104.204.29253.763.863.964.064.174.274.374.47263.914.014.124.234.334.444.554.66274.064.174.284.394.504.614.724.83284.214.324.444.554.664.784.895.01294.364.474.594.714.834.955.075.19304.514.634.754.875.005.125.245.37314.664.794.915.045.165.295.415.54324.814.945.075.205.335.465.595.72334.965.095.235.365.495.635.765.90345.115.255.385.525.665.805.946.07355.265.405.545.685.825.976.116.25表D:给出了沸程温度随气压变化的校正值。沸程温度随气压变化的校正值标准中规定的沸程温度/C气压相差1hPa的校正值/C10300.02630500.02950700.030901000.0321101300.0341301500.0351501700.0381701