Pasco TD-8592 SMALL PISTON HEAT ENGINE APPARATUS Manuel d'utilisateur télécharger pdf (Page 12)

012-08375A Small Piston Heat Engine

Experiment 3: Boyle’s Law

Theory

Boyle’s law states that the product of the volume of a gas times its pressure is a constant at a fixed

temperature:

➀ With the platform raised to its uppermost

position, connect the Pressure Sensor to a port on

the base apparatus with a short piece of tubing

(Figure 3.1).

➁ Close the shut-off valve on the tubing from the

unused port.

➂ Connect the Pressure Sensor to the computer

interface and set up DataStudio to record pres-

sure. Be sure that you set up the keyboard

sampling option so you can enter height data by

hand. (See “Manual Sampling” or “Keyboard

Sampling” in the DataStudio online help.)

Procedure

➀ Record the height of the piston and the pressure

when the platform is raised to its highest position.

➁ Press the platform down to a series of levels and

record the height and pressure at each level.

➂ Convert the height measurements to gas volume

measurements. (Hint: The diameter of the piston

is 32.5 mm.)

➃ Prepare a graph of pressure versus volume.

Therefore, at a fixed temperature, the pressure will be inversely related to the volume, and the

relationship will be linear:

*For details on setting up and operating the Pressure Sensor with DataStudio software, please

consult the instruction sheet for the Pressure Sensor and the DataStudio online help.

PV = a

Setup

➤ Note: At pressures greater than 120 kPa, the relationship between pressure and volume may

not be linear because of air leakage from the valves and ports at higher pressures.

Figure 3.1. Experiment setup

HEAT ENGINE

GAS LAW APPARATUS

Piston Dia.:

32.5mm±0.1

TD-8572

CAUTION:

Max. Pres.: 345kPa. Use Gases Only

DO NOT

Immerse in any Liquid

DO NOT Lubricate Piston or Cylinder

Pressure Port Mating Connector:

PASCO Part No. 640-021

Piston&Platform

Mass:

35.0g±0.6

PRESSURE

SENSOR

0-700 kPa

(ABSOLUTE)

CI-6532

PRESSURE

PORT

700 kPa MAX

DRY AIR ONLY

INTERFAC

SERIE

INTERFACE

To computer interface

Close the shut-off

valve on the tubing

from the unused

port.

Pressure Sensor

Equipment Required:

• Small Piston Heat Engine

• Pressure Sensor (CI-6532A)

• Science

Workshop computer interface*

• DataStudio software

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Pasco TD-8592 SMALL PISTON HEAT ENGINE APPARATUS Manuel d'utilisateur Page 12

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