{"product_id":"critical-point-apparatus","title":"Critical Point Apparatus","description":"Application Area: ..\u003cbr\u003e \tQualitative Observations: ..\u003cbr\u003e \t•\tLiquid and gaseous states\u003cbr\u003e \t•\tDynamic compression and expansion\u003cbr\u003e \t•\tFormation of the transition point at various temperatures\u003cbr\u003e \tQuantitative Measurements: ..\u003cbr\u003e \t•\tDisplay of the critical point and temperature\u003cbr\u003e \t•\tRecording of isotherms in p-V (Clapeyron) diagrams\u003cbr\u003e \t•\tRecording of isotherms in pV-p (Amegat) diagrams\u003cbr\u003e \t•\tPressure curves for a saturated vapor\u003cbr\u003e \t•\tDifferences between real gases and ideal gases\u003cbr\u003e\u003cbr\u003eProduct Information: ..\u003cbr\u003eA high-precision device for studying the compression and liquefaction of a gas, determining the critical point and recording isotherms in p-V (Clapeyron) diagrams. The test gas is sulfur hexafluoride (SF6), which has a critical temperature of 318.6 K (45.5°C) and a critical pressure of 3.76 MPa (37.6 bars), allowing for a simple experiment set-up.\u003cbr\u003eThe apparatus includes a transparent measuring cell that is highly resistant to leakage and compression. The volume inside the cell is changed via a finely adjustable hand-wheel, the change being indicated by a combination of a fixed and a rotary scale to an accuracy of 1\/1000 of the maximum volume. The pressure is generated by a hydraulic system containing castor oil of medically approved quality. The measuring cell and hydraulic system are separated by a cap seal which rolls in as the volume increases. This design means the pressure gradient between the measuring cell and oil chamber is negligible. A manometer measures gas pressure instead of oil pressure without taking up any dead space inside the measuring cell. During transitions from the gaseous to the liquid phases and vice versa, it is therefore possible to observe the formation of the first drops of liquid and disappearance of the last gas bubbles.\u003cbr\u003eThe measuring cell is enclosed in a transparent water chamber. A circulation thermostat allows the temperature to be maintained at a highly constant value, which can be monitored by means of a thermometer.\u003cbr\u003ePractical indications of the volume, pressure and temperature permit easy recording of p-V or pV-p diagrams providing qualitatively correct results. Pressure and temperature-dependent volumetric corrections also provide quantitatively accurate results comparing favorably with standard reference values.\u003cbr\u003eRefer also to experiment UE2040300.\u003cbr\u003e\u003cbr\u003eSpecifications: ..\u003cbr\u003eCritical temperature:\t318.6 K (45.5°C)\u003cbr\u003eCritical pressure:\t3.76 MPa (37.6 bars)\u003cbr\u003eCritical volume:\t197.4 cm3\/mol\u003cbr\u003eCritical density:\t 0.74 g\/mol\u003cbr\u003eTemperature range:\t10 – 60°C\u003cbr\u003eMaximum pressure:\t6.0 MPa (60 bars)\u003cbr\u003eMaximum volume:\t15.7 cm3\u003cbr\u003eManometer diameter:\t160 mm\u003cbr\u003eBore for temperature sensor:\t6 mm Ø\u003cbr\u003eTemperature control connections:\t7 mm Ø \u003cbr\u003eReducing valve connection:\t1\/8\" Ø \u003cbr\u003eStandard gas connection:\t3.5 mm Ø \u003cbr\u003eDimensions:\t380 mm x 200 mm x 400 mm approx.\u003cbr\u003eWeight:\t7 kg approx.\u003cbr\u003e\u003cbr\u003eNote: ..\u003cbr\u003eAccording to laboratory best practices, it is recommended to supply gas through a fixed pipeline when the critical point apparatus is used frequently. For occasional use, it is more practical to source the test gas from a gas cylinder.\u003cbr\u003e\u003cbr\u003eScope of delivery: ..\u003cbr\u003e1\t \tCritical point device filled with hydraulic (castor) oil but without test gas (SF6)\u003cbr\u003e1\t \tOil filling device\u003cbr\u003e1\t \tAngled 1.3-mm hexagonal spanner (for grub screw on rotary scale)\u003cbr\u003e1\t \tPlastic hose, 3 mm internal diameter\u003cbr\u003e1\t \t1\/8\" pipe screw connection (SW 11)\u003cbr\u003e1\t \tGrease gun\u003cbr\u003e\u003cbr\u003eNot in the scope of delivery, but additionally required: ..\u003cbr\u003e \t \tSulphur hexafluoride SF6\u003cbr\u003e\u003cbr\u003eNote: ..\u003cbr\u003eRequired for periodic degassing or refilling of hydraulic oil:\u003cbr\u003e \t \tCastor Oil (item no.: 1002671)\u003cbr\u003e \t \tHigh Power Vacuum Pump\u003cbr\u003e","brand":"3B Scientific","offers":[{"title":"Default Title","offer_id":49419079745813,"sku":"3BS1002670","price":13094.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/4897\/3845\/files\/U104001_01_1200_1200_Critical-Point-Apparatus.jpg?v=1761023387","url":"https:\/\/unitedsupplycorp.com\/products\/critical-point-apparatus","provider":"United Supply Corp.","version":"1.0","type":"link"}