Phys 1 Student Workbook.pdf

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Physics Labs with Computers, Vol. 1Student WorkbookP17: Pressure vs. Temperature 012-07000ASet Up the Displays1. In the Experiment Setup window, click and drag the Table display icon to the TemperatureSensor icon.2. In the Table display, add a column for Pressure. Click the Add-a-Column menu button( ) and select ‘Analog B, Pressure’ from the list.3. In the Experiment Setup window, click and drag the Digits display icon to the TemperatureSensor icon. Repeat the process to make another Digits display. Click and drag the Digitsdisplay icon to the Pressure Sensor icon.4. In the Experiment Setup window, click and drag the Graph display icon to the PressureSensor icon.5. Change the horizontal axis of the Graph display to show Temperature rather than Time.Click the Horizontal Axis Input menu button ( ). Select ‘Analog A,Temperature’ from the list.Record Data1. Set up the sensors and equipment as described earlier.2. Put the flask and Temperature Sensor into the first water bath.3. When you are ready, click ‘REC’ to start recording data.• The ‘Keyboard Sampling’ window will open. Arrange thewindows so you can see the two Digits displays.p. 120 © 1999 PASCO scientific P17
Name _____________________ Class ______________ Date _________4. When the readings for temperature and pressure stabilize, type‘1’ in the Keyboard Sampling window and click ‘Enter’ torecord the temperature and pressure for the first water bath.5. Move the flask to the second water bath. When the readings fortemperature and pressure stabilize, type ‘2’ in the KeyboardSampling window and click ‘Enter’ to record the temperatureand pressure for the second water bath.6. Move the flask to the third water bath. When the readings in theDigits displays stabilize, click ‘Enter’ to record the temperatureand pressure for the third water bath.7. Repeat the process for the next water bath.8. When you are ready to stop recording data, click ‘StopSampling’ in the Keyboard Sampling window. The KeyboardSampling window will automatically close.Analyze the Data1. Use the Graph display to determine whether or not the pressureand temperature relationship is linear. In the Graph display, clickthe ‘Statistics’ button ( ) to open the Statistics area. In theStatistics area, click the ‘Statistics menu’ button ( ) and select ‘Curve Fit, Linear Fit’from the menu.2. Use the Graph display to find a value for Absolute Zero. In the Graph display, use the‘Zoom Out’ buttons ( ) for the vertical and horizontal axes to re-scale the display untilyou can see the point where the ‘Linear Fit’ line crosses the X-axis. Then use the ‘SmartCursor’ ( ) to find the coordinates of that intersection point. The x-coordinate is shownbelow the label of the X-axis.3. Compare your value for Absolute Zero to the accepted value (-273 ˚C).4. Use your data to determine whether or not the relationship of pressure and temperature isdirect or inverse.(Hint: If the relationship is direct, the ratio of pressure (measured in atmospheres) totemperature (measured in Kelvins) is constant. If the relationship is inverse, the product ofpressure and temperature is a constant. In other words, if P/T is a constant, the relationshipis direct. If P•T is a constant, the relationship is inverse.)• Convert the pressure data from kilopascals to atmospheres (1 atm = 101 kPa) and record inthe Data Table. Convert the temperature data from Celsius to Kelvin (K = ˚C + 273) andrecord in the data table.• Calculate the ratio of pressure (atm.) and temperature (K). Calculate the product of pressureand temperature. Compare.5. Use your observations and data to answer the questions in the Lab Report.Record your results in the Lab Report section.P17 © 1999 PASCO scientific p. 121
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