# Lesson 8

Pressure in gasses
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Slide 1: Tekstslide

In deze les zitten 17 slides, met tekstslides.

## Onderdelen in deze les

Pressure in gasses

#### Slide 1 -Tekstslide

This lesson
• Recap
• Pressure in gasses

Recap

#### Slide 3 -Tekstslide

Pressure in liquids — Hydraulics

0.01 m2
0.4 m2
20 N
1
2
800 N

#### Slide 6 -Tekstslide

• Fluids are incompressible

P1=P2
1
2
A1F1=A2F2

#### Slide 7 -Tekstslide

P1=P2
A1F1=A2F2
Rearranging the formula!
1
2
Write out in words what each symbol stands for
F1A2=A1F2

#### Slide 8 -Tekstslide

Worksheet hydraulics

#### Slide 9 -Tekstslide

Pressure in gasses

#### Slide 10 -Tekstslide

Pressure in gasses — Questions
1. What produces pressure in gasses?
2. Why does the pressure inside of a balloon increase when you put more air into it?
3. What is the relationship between the pressure in a gas and the volume of the container it is in?
4. Is the relationship between the pressure in a gas and the volume of the container it is in directly proportional and inversely proportional?
5. What do you call the pressure the air around you exerts on your body?
6. Is the pressure at a mountain top larger or smaller than at sea level? Explain why.
7. Why do mountain climbers have to carry oxygen tanks with them when climbing high mountains?

#### Slide 11 -Tekstslide

Pressure in gasses — Questions
1. What produces pressure in gasses?
• The collisions between the particles in the gas
• The particles bumping into each other and their environment.

2. Why does the pressure inside of a balloon increase when you put more air into it?
• The particles get pushed closer together. Because of this there are more collisions. This causes the pressure to rise.

#### Slide 12 -Tekstslide

Pressure in gasses — Questions
3. What is the relationship between the pressure in a gas and the volume of the container it is in?
• Increasing the volume of the container causes the pressure to decrease.
• Decreasing the volume of the container causes the pressure to increase.

4. Is the relationship between the pressure in a gas and the volume of the container it is in directly proportional and inversely proportional?
•  It is an inversely proportional relationship

#### Slide 14 -Tekstslide

Pressure in gasses — Questions
5. What do you call the pressure the air around you exerts on your body?
• Atmospheric pressure.

6. Is the pressure at a mountain top larger or smaller than at sea level? Explain why.
• At a mountain top the pressure in the air is smaller.
• This is because gravity's pull is weaker at that height.

7. Why do mountain climbers have to carry oxygen tanks with them when climbing high mountains?
• Because the air is less dense at great heights, because of this there is less oxygen in the air.

#### Slide 16 -Tekstslide

Homework
• Look at the following Phet simulation — What can you learn about pressure in gasses about it?

• Do the ybellowblock exercises of 8.5 and 8.5.