項目八：常規(guī)物理常數(shù)與性能分析任務(wù)四：液體密度的測定

密度瓶法測定磷酸密度課程：工業(yè)分析中文Scenario8:PhysicalconstantsandperformancetestingTask4:DeterminationofliquiddensityDensitybottlemethodfordeterminingthedensityofphosphoricacidCourse:IndustrialAnalysisEglish1、儀器通常密度瓶容量有5、10、25、50mL

帶毛細管的普通密度瓶附有特制溫度計、帶磨口帽的小支管的密度瓶1-主體，2-倒管，3-側(cè)口，4-罩，5-溫度計磷酸密度測定用25mL中文1、InstrumentTypically,densitybottleshavecapacitiesof5,10,25,and50mL

OrdinarydensitybottlewithcapillarytubeDensitybottlewithspecialthermometerandsmallbranchpipewithgroundcap1-mainbody,2-invertedtube,3-sideport,4-cover,5-thermometer25mLforphosphoricaciddensitydeterminationEglish2、測定原理在規(guī)定溫度下，分別測定充滿同一密度瓶的水及磷酸的質(zhì)量，由水的質(zhì)量和密度可以確定密度瓶的容積即充滿密度瓶磷酸的體積，根據(jù)密度的定義，可以計算磷酸的密度。

不適于測易揮發(fā)液體試樣的密度中文2、MeasurementprincipleAtthespecifiedtemperature,measurethemassofwaterandphosphoricacidfilledwiththesamedensitybottleseparately.Thevolumeofthedensitybottle,i.e.thevolumeofphosphoricacidfilledwithdensitybottle,canbedeterminedbythemassanddensityofwater.Basedonthedefinitionofdensity,thedensityofphosphoricacidcanbecalculated.Massofsamplefilledwithdensitybottle,Massofwaterfilledwithdensitybottle,waterdensity,Eglish3、測定方法濾紙擦干瓶外身，稱重m2精確稱重m1干燥清洗干凈裝滿蒸餾水，蓋上瓶蓋，20℃水浴0.5小時同法操作，同一溫度同一個比重瓶測定磷酸的質(zhì)量m3中文3、MeasurementmethodDrytheouterbodyofthebottlewithfilterpaperandweigh,m2weigh,m1dryCleanthoroughlyFillwithdistilledwater,capthebottle,andplaceina20℃waterbathfor0.5hoursUsingthesamemethodtodeterminethemassofphosphoricacidatthesametemperatureandusingthesamespecificgravitybottlem3Eglish4、注意事項裝入液體時，必須使瓶中充滿液體不要有氣泡留在瓶內(nèi)外壁擦干后稱量，稱量需迅速進行操作時戴細紋手套，手持瓶頸部中文4、NoteWhenfillingtheliquid,thebottlemustbefilledwithliquidandthereshouldbenobubblesleftinsidethebottleAfterdryingtheouterwall,weighitquicklyWearfinestripedglovesduringoperationandholdtheneckofthebottlewithyourhandsEglish5、密度計算

=×考慮空氣浮力的影響：0.99820―水的20℃的密度，g/cm3

0.0012―20℃大氣壓為760毫米汞柱時的空氣密度，g/cm3

中文5、Densitycalculation=×Considertheimpactofairbuoyancy：0.99820―Thedensityofwaterat20℃，g/cm3

0.0012―Airdensityatatmosphericpressureof760millimetersofmercuryat20℃，g/cm3

Eglish舉例：20℃時一個空密度瓶的質(zhì)量是0.5Kg，裝滿水后的總質(zhì)量為1.3Kg，裝滿某種液體后的總質(zhì)量為1.14Kg，則這種液體的密度是多少？解：考慮空氣浮力的影響：(g/cm3)中文example：At20℃,themassofanemptydensitybottleis0.5Kg,thetotalmassfilledwithwateris1.3Kg,andthetotalmassfille