Pasco TD-8595 Absolute Zero Apparatus Manuel d'utilisateur télécharger pdf (Page 5)

Absolute Zero Apparatus Model No. TD-8595

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.

Theory:

For an ideal gas, the absolute pressure is directly proportional to the absolute temperature of

the gas.

Thus a plot of temperature vs. pressure will result in a straight line.

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.

Figure 1: Absolute Zero

Apparatus

ope x

()

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Pasco TD-8595 Absolute Zero Apparatus Manuel d'utilisateur Page 5