Particles on the Move

• Physics
• Secondary Education
• Age 13

Forces and Motion

Lesson 09. 

Particles on the Move

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Highlights of the Day

• use the particle theory to explain pressure in gases and liquids (qualitatively only)

• Values :  Responsibility and Determination

Review Quiz P2

As with liquids, the pressure in a gas _____________ with depth.

1. decreases
2. increases
3. remains constant

____________ is height above sea level.

1. Altitude
2. Attitude
3. Latitude

Most people on Earth live at _______ altitude.

1. higher
2. lower
3. slower

The atmospheric pressure near sea level is __________ than that farther away from sea level.

1. higher
2. lower
3. slower

Sea level is where the atmosphere is at its "deepest". At sea level, atmospheric pressure is ___________.

1. zero
2. lowest
3. equal
4. highest

Think about...

Questions

•  How can you smell food cooking when you are some distance away from the food?
• When you pour orange juice into water, why does all the water eventually turn orange?

gas particles

The particles in a gas move randomly. Both the speed of the particles and the direction of the particles are __________.

1. constant
2. random
3. fixed
4. in one way

If we mix two gases in one container, each one will have particles that move randomly. That means each gas will _____________ to fill the container.

1. move in one direction
2. spread or scatter
3. evaporate
4. disappear

As you go higher in the atmosphere, the number of particles in of air ___________, so the concentration of gas particles decreases.

1. decreases
2. increases
3. remains constant
4. becomes zero

_____________ means the overall random movement of particles from an area where they are in "higher concentration" to an area where they are in "lower concentration".

1. Diffusion
2. Particle theory
3. Movement
4. Constant

phet.colorado.edu

Speed of Diffusion

• The speed of diffusion depends on: the difference in concentration of the particles and temperature.

Summary

Self-survey: Rate your level of understanding and participation in this lesson.

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