3.3 Pressure in gases

Question 1

What happens when blowing up a balloon

Answer 1

There are loads of air molecules hitting the inside of the balloon, the collisions between air molecules and balloon produce gas pressure (air pressure)

Question 2

What is happening inside a balloon

Answer 2

The collisions of air molecules make a high gas pressure because there is a big force over a small area.
-gas pressure is exerted in all directions

Question 3

Changing volume, what will happen if you squash the balloon

Answer 3

There will be more collisions between gas molecules and the balloon. Pressure increases

Question 4

What differences will occur when you cool down the temperature

Answer 4

Its molecules move more slowly, if the item doesn’t change shape the pressure decreases.
There is also fewer collisions with the sides

Question 5

Cold gas =

Answer 5

fewer and less energetic collisions

Question 6

Hot gas=

Answer 6

more collisions that are more energetic

Question 7

As you pump more gas into a bicycle wheel the gas becomes compressed.
Q1- more/less molecules- more/less collisions
Q2- is the force big or small

Answer 7

Q1- more molecules- more collisions

Q2- big because the pressure is big

Question 8

Atmospheric pressure definition

Answer 8

Pressure caused by the collisions of air molecules that produce a force on an area

Question 9

State what happens to the Atmospheric pressure as you go up a mountain

Answer 9

the smaller Atmospheric pressure makes it hard for mountain climbers to breathe in enough oxygen. They usually take up tanks when they climb high.

Question 10

What do tanks contain

Answer 10

oxygen gas that has been compressed into a small volume