拉脫法測(cè)液體表面張力系數(shù)數(shù)據(jù)處理

0.0 0.5 1.01.5 2.0 2.5 3.0 3.5 4.0U?0.0 0.5 1.01.5 2.0 2.5 3.0 3.5 4.0U?M關(guān)系圖實(shí)驗(yàn)4.1拉脫法測(cè)液體表面張力系數(shù)實(shí)驗(yàn)數(shù)據(jù)及其數(shù)據(jù)處理:1.硅壓阻力敏傳感器定標(biāo)砝碼Mg0.501.001.502.002.503.003.50電壓U/mV14.829.944.759.874.789.7105.0U/mVM/g斜率k=100,0=30.1V/kg3.32g大、車(chē)=9.8011m/s2，U=MgB=kM力敏傳感器靈敏度B=-=_J°L=3.07V/Ng9.80112.金屬環(huán)外、內(nèi)直徑的測(cè)量次數(shù)123456平均值D1(mm)34.9234.9234.9434.9634.9034.9034.923D2(mm)33.1033.1433.1433.0833.1233.1433.120芝(D-D)2

1i 1氣(DP*D「t—一(34.92-34.923)2+(34.92-34.923)2+(34.94-34.923)2+(34.96-34.923)2+(34.90-34.923)2+(34.90-34.923)2= 5=0.024mm,Ab(D1)=0.02mm,Ud=Ja；+A：=.0.0242+0.022=0.03mmD1土Ud=(34.92土0.03)mm￡啊-D)2②A(D)=b=\：-i=i——2i 2—=0.025mm,A(D)=0.02mm,A2 D2 \ 6-1 B2要有代數(shù)過(guò)程UD=堯+A;=J0.0252+0.022=0.03mmD±U=(33.12土0.03)mm3.豎直方向表面張力時(shí)電壓和拉斷后電壓的測(cè)量次數(shù)123456平均值U1(mV)-7.0-7.1-7.1-7.2-7.4-7.5U2(mV)-52.8-52.9-52.8-52.9-52.9-53.0AU(mV)45.845.845.745.745.545.545.68A(AU)=q=「4=1 i =0.14mV，A(AU)=氣.2x0.05=0.07mV，A AU 丫6-1 B'''要有代數(shù)過(guò)程UAU=Ja；+A;=J0.142+0.072=0.16mVAU±Uau=45.68±0.16mV4.求表面張力系數(shù)aa=乎—= 45.68 =6.96x10-2N/mkB(D+D) 3.142x3.07x(34.92+33.12)dIna dIna dIna、由公式U(a)=EUAU)"(~DUD1)"(1^UD2)2、 1 2得，U(l)=r2+烏i+K=：(，竺2+0.032+°?032=0.4%(D+D)2 45.68 (34.92+33.12)2Ua=a-U(a)=6.96x10-2x0.4%=2.8x10-4N/m「a土Ua=(6.96土0.03)x10-2N/mU(a)=0.4%r5.與理論值比較，求相對(duì)誤差。水溫：t=27.01，a理=7.15x10-2N/ma-a 理ax100%=7.15-6.96JA5x100%=2.7%溫度10C121314151617a/(10-3N-m-1)73.773.673.473.373.173.0溫度t]0C181920212223^(10-3N-m-1)72.872.772.572.47