1. The Gas Laws
Pressure, volume and temperature

2. Boyle’s Law
 Robert Boyle (1627 –
1691) was a chemist and
philosopher.
 He discovered that gases can be
compressed.
 Boyle took great care to ensure that the
trapped gas he was studying stayed at the
same temperature.
 He noticed that when he doubled the
pressure, the volume halved.
 This discovery is called Boyle’s Law.

3. Boyle’s Law
 Boyle’s Law can be expressed using
the following equation:
p1V1 = p2V2
 This means that if you take a fixed
mass of gas at pressure p1 and
volume V1, and change either the
pressure or the volume, the product of
the pressure and the volume will not
change.

4. Pressure and Volume

5. Temperature
 Boyle took great care to carry out his
experiment at a constant temperature.
 He was aware that temperature also
has an effect on the pressure of a gas.
 If we heat a gas up the pressure
increases and if we cool it down, the
pressure decreases.
 There is a linear correlation between
temperature and pressure.

6. Temperature
 The relationship between temperature
and pressure can be summed up as
follows:
p1 p2
=
T1 T2
 (T must be measured in Kelvin)
YOU NEED TO KNOW THIS!