PASCO TD-8595 User Manual
Instruction Manual
Manual No. 012-08504A
Absolute Zero
Apparatus
Model No. TD-8595
Absolute Zero Apparatus Model No. TD-8595
Table of Contents
Equipment List........................................................... 3
Introduction ............................................................. 4
Theory ................................................................... 4
Equipment Setup ........................................................ 5
Suggested Experiments ................................................. 6
Exp. 1: Determining Absolute Zero while Keeping the Number of Gas Moles (n) Constant.......6
Exp. 2: Determining Absolute Zero while Varying the Number of Gas Moles (n).......................7
Appendix A: Specifications............................................. 9
Appendix B: DataStudio Setup Instructions ......................... 10
Appendix C: Creating Equations in DataStudio....................... 11
Appendix D: Technical Support ....................................... 12
Appendix E: Copyright and Warranty Information .................. 12
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Model No. TD-8595 Absolute Zero Apparatus
Absolute Zero Apparatus
Model No. TD-8595
Equipment List
Included Equipment Replacement Model
Number*
1. Absolute Zero Apparatus TD-8595
*Use Replacement Model Numbers to expedite replacement orders.
Additional Equipment Required Replacement Model
Number*
A PASCO computer interface (PASPORT™ or
DataStudio software (version 1.7 or later) Various (See
Steam Generator or Hot Plate (or other means of heating water) TD-8556 or
Absolute Pressure Sensor or combination Pressure/Temperature
Sensor
Temperature Sensor or Thermistor Sensor*
Ice (approximately 2 cups) N/A
A computer N/A
ScienceWorkshop
®
)*
Various (See
PASCO catalog.)
PASCO catalog.)
SE-8767
PS-2107 or
CI-6532A or
PS-2146
PS-2125 or
CI-6527A
*PASCO sensors require a PASPORT interface;
ScienceWorkshop
and works with any PASPORT interface. If you have a
Thermistor Sensor (instead of a PS-2125 Temp. Sensor) to use the Absolute Zero Apparatus.
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interface. A Fast Response Sensor is molded into the Absolute Zero Apparatus
ScienceWorkshop
ScienceWorkshop
sensors require a
interface, you will need a
3
Absolute Zero Apparatus Model No. TD-8595
b
()
Introduction
The Absolute Zero Apparatus consists of a Fast Response
Temperature Sensor and plastic tubing (with pressure
connector) mounted into a hollow copper sphere. When
the sphere is submerged in a water bath and connected to a
temperature sensor, pressure sensor, and a computer
interface, DataStudio records and displays the temperature
and pressure.
The Fast Response Temperature Sensor plugs into any
PASPORT Temperature Sensor box or a ScienceWorkshop
Thermistor Sensor, allowing the Absolute Zero Apparatus
to be used with both PASCO’s PASPORT and
ScienceWorkshop interfaces.
The Absolute Zero Apparatus is used to experimentally determine the temperature of
absolute zero (in degrees Celsius). Absolute zero, by definition, is the point at which a gas
exerts zero pressure. With a computer, the Absolute Zero Apparatus can help students to
observe the relationship between temperature and pressure and use DataStudio to
mathematically extrapolate to find absolute zero.
Figure 1: Absolute Zero
Apparatus
Theory:
For an ideal gas, the absolute pressure is directly proportional to the absolute temperature of
the gas.
V
=
T
Thus a plot of temperature vs. pressure will result in a straight line.
=+
yslope x
=
T
The slope of the line depends on the amount of gas in the thermometer, but regardless of the
amount of gas, the intercept of the line with the temperature axis should be at absolute zero.
If we instead plot the temperature in degrees Celsius, the intercept will not be zero, but rather
the temperature of absolute zero in degrees Celsius.
nR
V
nR
P
+
P
0
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