3B SCIENTIFIC PHYSICS U30046 Manuel page 3

3B SCIENTIFIC ® PHYSICS
Instruction Sheet
11/08 ALF
1. Safety instructions
•
Avoid going beyond range on pressure meter.
2. Description
Boyle's Law apparatus is used for the experiment-
based determination of the relationship between the
volume and the pressure of a gas (air) at constant
temperature (Boyle's Law).
Boyle's law states that for a given mass of gas (air) at a
constant temperature the product made up of the
volume V and the pressure p is constant:
1
⋅ = ⇒ = ⋅
P V k p k
V
Boyle's Law Apparatus U30046
The apparatus is essentially a calibrated glass tube
mounted on a white metal plate. The glass tube is
extra strong and additionally protected by a plastic
safety screen. It is connected to an oil reservoir on
which a Bourdon gauge is fitted. By means of a hand
pump coloured oil is gradually pumped from the oil
reservoir into the tube creating over pressure. Whilst
the volume of the trapped is read from a scale clearly
visible at the tube, pressure is measured by a Bourdon
gauge, which reads in Pa x 10
5
1.01325 x 10 Pa). The Bourdon gauge is fitted with a
transparent plastic back to allow students to see its
working parts.
1
1 Spare oil
2 Oil reservoir
3 Hose connection
4 Bourdon gauge
5 Plastic safety screen
6 Calibrated glass tube
7 Metal plate
5
. (Standard pressure =