3b-scientific Boyle's Law Apparatus User Manual download pdf

Instruction sheet

3B SCIENTIFIC® PHYSICS

U17210 Boyle’s law apparatus

5/03 ALF

This apparatus is used for the experiment-based deter-

mination of the relationship between the volume and

the pressure of a gas (air) at constant temperature (Boyle’s

law).

1. Description, technical data

The apparatus consists of an enclosed plexi-glass cylin-

der with graduated scale to determine volume and a

flange-mounted manometer for pressure readings and

includes an aeration and de-aeration valve. By turning

the knob the threaded rod moves the piston up an down

inside the cylinder thus varying the volume. This permits

the generation of over- and underpressure. Two O-rings

attached to the piston seal off the air. These are lubri-

cated with a small amount of silicon oil. For safety rea-

sons the power cylinder is encased in an additional plexi-

glass cylinder.

Power cylinder:

Length: 300 mm

Diameter: 40 mm (interior)

Piston: 30 mm x 40 mm Ø

Scale:

Length: 250 mm

Scale div.: 5 mm

Manometer:

Pressure range: –10 N/cm² - 30 N/cm²

Diameter: 100 mm

1 Manometer

2 Handscrew for the metering valve

3 Working cylinder with protective cylinder

4 Piston with O-rings

5 Scale

6 Rotary knob with threaded rod

43 5

2. Operation

Perform an experiment to verify Boyle’s law which states

that for a given mass of gas (air) at a constant tempera-

ture the product made up of the volume and the pres-

sure is constant.

The volume of the air column is computed out of the

product of the cylinder’s cross-section and the length of

the air column. As the cross-section is a fixed variable,

the change in volume can only be expressed by varying

the length of the air column.

• Ventilate the cylinder by turning the hand valve screw

to the left.

• Set the piston to the 25 cm mark. If the piston is stuck

the best remedy is to turn it slightly right to left, so

that the O-rings come into contact with the silicone

oil.

• Close the valve. The manometer gage pointed indi-

cates an initial pressure of 1.

• Before each pressure reading tap your finger softly

against the manometer to make sure that the pointer

is on the right setting.

• Turn the rotary knob to slide the piston to the 24 cm

mark and read off and note down the next pressure

level.

• Repeat the procedure in 1 cm steps.

• Enter all the values into a graph (see Figure).

• Proceed accordingly for the case that Boyle’s law is to

be verified for decreasing pressure. Start here with an

air column length of 7 cm.

1 2

Summary of Contents

Page 1 - U17210 Boyle’s law apparatus

3Instruction sheet3B SCIENTIFIC® PHYSICSU17210 Boyle’s law apparatus5/03 ALF®This apparatus is used for the experiment-based deter-mination of the re

Page 2 - 1% = 0.63

43. Measurement exampleOver 10 N/cm2 Vpp x V25 10.0 250.024 10.3 247.223 10.8 248.422 11.2 246.421 12.0 252.020 12.5 250.019 13.2 250.818 14.0 252.017

3b-scientific Boyle's Law Apparatus User Manual

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3b-scientific Boyle's Law Apparatus User Manual

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