3B Scientific Boyle-Mariotte Apparatus - Manual

3B SCIENTIFIC® PHYSICS
1
Boyle’s Law Apparatus E 1017366
Instruction manual
12/13 SD/ALF
1 Manometer
2
Inlet and outlet valve
3 Safety valve
4 Piston with ring-shaped
gaskets
5 Main cylinder
6 Crank with threaded shaft
7 Scale
1. Description
Boyle’s law apparatus E is for investigating the
relationship between volume and pressure in a
body of air inside an enclosed space at con-
stant temperature. It also serves to confirm
Boyle’s law.
The apparatus consists of an enclosed perspex
cylinder with a piston which can be moved in
order to modify the volume enclosed. There is
also a scale for determining the volume and a
manometer to measure the pressure. The pis-
ton is moved by turning a threaded shaft with a
crank handle. The force needed to achieve this
is not very large since the ring gaskets on the piston are lubricated with a small amount of
silicone oil.
An air inlet/outlet valve can equalise pressure
with the surrounding atmosphere with the piston
in any position. Any movement of the piston
thereafter results in the pressure changing to
above or below atmospheric pressure depend-
ing on the initial conditions.
A safety valve opens if the excess pressure
should rise to more than 3.5 bars.