测定空气的导热系数报告

1、测定干燥空气的导热系数五、数据记录及处理1实验条件(1)测量室参数：热线长度：l=18.10cm热线0c时电阻值& =40.53热线直径Di =0.0192mm测量室内直径 D2=15.22mm实验室参数：室温 t2 =32.5 0cT2=273.15+32.5=305.6K3油建汨序,Rt Ro=99.7 40.5359.2 10淖4。热线温度t1。5.1 10 3 40.53207286 CRo20 U273.15 286559K(R99.7R 99.70.2 )2、数据记录(kpa)(v)(mA)(W)UI P真空(W)(W)0 (真3.9039.10.1520.00099.720.10

2、007.6276.80.5800.4340.5201.001.9599.120.15008.3984.30.7070.5550.6660.6671.5099.500.20008.9389.60.8000.6480.7780.5001.2999.700.25009.3193.60.8710.7190.863 10.4031.1899.400.30009.6997.30.9460.7910.9490.3381.0299.400.35009.98100.00.9980.8461.020.2860.98599.810.400010.25102.51.0530.9051.060.2520.92899.8

3、10.4500、10.45104.51.0960.9361.1600.2260.88999.800.500010.62106.51.1310.9791.1700.2000.85199.700.55001 10.80108.01.1701.0181.2210.1820.81999.860.600010.96109.81.2031.0511.2610.1660.79299.820.650011.08110.91.2291.0771.2920.1540.77399.900.700011.19112.11.2541.1021.3220.1430.75699.820.750011.31113.21.28

4、01.1281.3540.1330.73999.910.800011.41114.11.3041.1521.3820.1250.72499.820.850011.49115.11.3221.1701.4040.1180.71399.820.900011.58116.01.3431.1911.4290.1110.70199.800.950011.70116.41.3611.2121.4540.1050.68899.811.000011.78117.81.3861.2301.4770.1000.67899.833、数据处理(1)处理 1:0920 1 w因为K K32/273.15近似成立（查表可

5、得Ko则至T2间的平均与热系数测量百分差：Epi KJ 44 4&8.5%六、实验结果讨论及误差分析:1、从百分差计算中可知：用外推法求Q时，连线照顾气压较低的点太多，应该连线取5lOmmHg上的测量点为主。2、 虽然Ea百分差较小，但也存在一定的误差，其主要原因是压强计在某一压强压强计数时,其对应的U和I还有一个变动区间。3、。低的修正值是否一定是1.2系数，在外界温度不同条件下是否该系数会变。 t34、平均导热系数的理论值是否科学、可靠，因为K Kop273 i5 2只是近似成立。七、注目点：1、 仪器中的抽气阀在真空泵停止工作时，一定要将抽气阀旋止“大气”位置，否则回油，损坏测量室。2、漏气