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Slide 1

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P3 Revision…read more

Slide 2

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Kinetic Theory and Temperature in
Kinetic Theory says Gases are Randomly Moving Particles:
1. Kinetic theory says gases consist of very small particles.
Which they do ­ oxygen consists of oxygen molecules,
neon consists of neon atoms
2. These particles are constantly moving in completely
random directions
3. They constantly collide with each other and with the walls
of their container. When particles collide they bounce off
each other or off the walls
4. The particles hardly take up any space. Most of the gas is
empty space…read more

Slide 3

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Absolute Zero is as Cold Stuff can get:
· If you increase the temperature of something, you give its
particles more energy ­ they move about more quickly or
vibrate more. In the same way, if you cool a substance
down, you're reducing the kinetic energy of its particles
· The coldest that anything can ever get is -273°C ­ this
temperature is know as absolute zero. At absolute zero,
atoms have as little kinetic energy as it's possible to get
· Absolute zero is the start of the Kelvin scale of temperature
· A temperature change of 1°C is also a change of 1K ­ the
two scales are similar ­ the only difference is where zero
occurs.…read more

Slide 4

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To convert degrees to kelvins = just add 273
To convert kelvins to degrees = just subtract
273…read more

Slide 5

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Kinetic Energy is Proportional to Temperature:
· If you increase the temperature of gas, you give its particles
more energy
· In fact, if you double the temperature (measured in
Kelvins) you double the average kinetic of the particles
The temperature of a gas (in Kelvins) is proportional
to the average kinetic energy of its particles
· As you heat up a gas, the average speed of its particles
increases. Anything that's moving (e.g. a bunch of particles)
has kinetic energy kinetic energy is 1/2mv² remember.…read more

Slide 6

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Kinetic Theory and Pressure in Gases
Kinetic Theory says Colliding gas particles create Pressure:
· As gas particles move about, they bang into each other and
whatever else happens to get in the way.
· Gas particles are very light, but they sure isn't massless.
When they collide with something, they exert a force on it.
In a sealed container, gas particles smash against the
containers walls ­ creating an outward pressure
· This pressure depends on how fast the particles are going
and how often they hit the walls
· If you heat a gas, the particles move faster and have more
kinetic energy. This increase in kinetic energy means the
particles hit the container walls harder and more often,
creating more pressure. In fact temperature and pressure
are proportional ­ double the temp, double the pressure…read more

Slide 7

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Slide 9

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Slide 10

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thanks, useful :)



very helpful.can u please keep going

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