3B Scientific Boyle-Mariotte Apparatus - Manual (Page 2)

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Subject to technical amendments
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2. Technical data
Main cylinder:
Length: 230
mm
Internal diameter: 50 mm
Maximum pressure: 3.5 bars
Piston: 22 mm x 50 mm diam.
Volume: 410 cm³
Dead space volume V
0
: 20 cm³ approx.
Scale:
Length: 200
mm
Divisions: 1 mm
Manometer:
Pressure range:
0 – 4 bars
Diameter: 100 mm
Tolerance class 1
3. Operation
• Turn the piston back and forth a little so that
the gaskets come into contact with the sili-
cone oil.
• Set the piston to the desired point, e.g. 20
cm and let air into the cylinder to equalise
the air inside with the surrounding atmos-
phere (p = 1 bar).
• Close the air inlet/outlet valve.
• Move the piston to a new position by turn-
ing the threaded shaft.
• Read off the piston position s and the pres-
sure p.
• Calculate the volume V using the following
expression
2
0 4
d
V s V
= ⋅ π ⋅ + where d = 50 mm, V
0
= 20
cm³
• Plot the measurements on a graph.
Note: the amount of air with which the Boyle’s
law apparatus is filled depends on the position
of the piston when the pressure was equalised
with the surrounding atmosphere. The maxi-
mum quantity of air inside is reached when the
piston is at 20 cm.
Fig. 1 Pressure-volume diagram for air at room tem-
perature with three different amounts of substance