espere Environmental Science Published for Everyobody Round the Earth
Printer friendly version of this page
Home    Contact    Encyclopaedia    Mobility    International    PDF    magazine    - ? -   
Clouds and Particles
basics
more
1. What happens in clouds?
2. Particles
- Properties of particles
- Transformation and removal
- Particles and respiratory tract
* Worksheet 1
* Worksheet 2
3. Clouds, particles and climate
Links
PDF
     
 

Download

 
 
clouds and particles

Clouds & Particles

More


2. Particles - more


Worksheet 2

 

 

basicsmore
basicsmore
basicsmore
basicsmore
basicsmore
basicsmore
basicsmore
basicsmore
 

1. What is:

a) cloud processing?

b) dry deposition?

c) wet deposition?


 

clipart

1. Image: Microsoft clipart

2. Aerosols and health

a) Why are small particles more dangerous to inhale than bigger ones?

b) What other property determines how hazardous a particle is to our health?

 

 

3. Experiment: Making a cloud in a bottle

You will need:

  • one transparent plastic bottle (at least 1.5 litres in size) with a bottle cap
  • hot water
  • matches

Procedure:

  1. make sure the bottle is clean inside
  2. pour hot water into the bottle to a depth of about 3 cm
  3. close the bottle 
  4. rotate the bottle around so that the whole of the bottle is wet inside
  5. pour out the water
  6. light a match and as soon as the tip of the match has finished flaring, blow it out 
  7. let the smoke from the match enter the bottle (if you squeeze the bottle and hold the match close to the opening while you remove the pressure from the bottle the smoke from the match will be drawn into the bottle)
  8. close the bottle
  9. increase the pressure in the bottle by squeezing it. 

Can you see a cloud appearing in the bottle? If you remove the pressure in the bottle by loosening the cap, the cloud will disappear.

Can you explain this? Smoke is made up of a large number of very small particles. Why do you need the smoke to make the cloud in the bottle.

 


About this page:
Authors: Ellen K. Henriksen and Camilla Schreiner - University of Oslo - Norway. Scientific reviewer: Justine Gourdeau - LaMP Clermont ferrand - France - 2004-01-13. Last update: 2004-03-27.

  

 top

ESPERE / ACCENT

last updated 02.03.2006 21:10:43 | © ESPERE-ENC 2003 - 2013