Topic 2 - Developing Fuels
, Ideal gases
Simple particle model
Temperature scales
● The kelvin absolute temperature scale is most fundamental
because it begins at zero.
● A change of 1oC is the same as a change of 1 K.
Pressure
● Caused by collisions of gas particles on the wall of the
container.
● Pressure = force per unit area
Ideal gas (gas constant is always 8.314)
To describe gases more precisely you need to
consider temperature, pressure and volume.
● Theoretical gases that follow a set of gas
laws.
● Many gases behave like ideal gases at
“normal” temperature/pressure.
● We all assume all gases behave like this
○ Randomly moving particles
○ Particles negligible in size compared to separation
○ No intermolecular forces (not true)
, Change of Change of volume on Change of
temperature on the the pressure temperature on the
pressure volume
Avogadro's law
One mole of any gas occupies a volume of 24dm3 at room
temperature and pressure 25oC, 1 atmospheric pressure (101KPa)
● The particles of a gas are negligible in size compared to the
separation of the particles.
● The size of the molecules makes no difference to the volume
of a gas.
● Equal volumes of different gases at the same temperature and
pressure contain the same number of moles.
Moles = volume
24dm3
Hydrocarbons
● Compounds containing atoms of hydrogen and carbon only
, Ideal gases
Simple particle model
Temperature scales
● The kelvin absolute temperature scale is most fundamental
because it begins at zero.
● A change of 1oC is the same as a change of 1 K.
Pressure
● Caused by collisions of gas particles on the wall of the
container.
● Pressure = force per unit area
Ideal gas (gas constant is always 8.314)
To describe gases more precisely you need to
consider temperature, pressure and volume.
● Theoretical gases that follow a set of gas
laws.
● Many gases behave like ideal gases at
“normal” temperature/pressure.
● We all assume all gases behave like this
○ Randomly moving particles
○ Particles negligible in size compared to separation
○ No intermolecular forces (not true)
, Change of Change of volume on Change of
temperature on the the pressure temperature on the
pressure volume
Avogadro's law
One mole of any gas occupies a volume of 24dm3 at room
temperature and pressure 25oC, 1 atmospheric pressure (101KPa)
● The particles of a gas are negligible in size compared to the
separation of the particles.
● The size of the molecules makes no difference to the volume
of a gas.
● Equal volumes of different gases at the same temperature and
pressure contain the same number of moles.
Moles = volume
24dm3
Hydrocarbons
● Compounds containing atoms of hydrogen and carbon only
