1. Atmosphere Presentation by Jerry Po ř ízka & Lucy Pa ř íkova

2. Atmosphere Fluent cover of Earth Into 560 kilometers above surface Earth is composed of molecules Air is matter Air is composed of different gasses  Nitrogen – N 2  Oxygen – O 2  Carbon dioxide – CO 2  Water vapor – H 2 O (g)  Noble gasses

3. Atmospheric layers Troposphere Tropopause Stratosphere Ozonosphere Mezosphere Thermosphere Ionosphere

4. Atmosphere in former times Chemical structure of atmosphere was changed Primary structure was: N2N2  NH 3 H2OH2O  CO 2 Synthesis of formaldehyde → oxygen: H 2 O + CO 2 → HCOH + O 2 By the activites of UV radiation ozone was formed

5. Atmosphere today Today chemical structure of atmosphere is:  N 2 78,08%  O 2 – 20,496%  CO 2 – 0,033%  H 2 O (g)  Noble gasses – mostly Ar – 0,934% Thanks to photosynthesis oxygen is produced 6CO 2 + 12H 2 O → C 6 H 12 O 6 + 6O 2 + 6H 2 O Today air is polluted by harmful gasses: H 2 S, Cl 2, N 2 O, NO 2, SO 2, CO,

6. Physical properties Gases are coercible Air molecules are in constant motion They come in contact with surfaces – they push and press the surface – That creates the air Pressure –We can measure air pressure to help us predict weather conditions around the world

7. Elements in the Atmosphere Oxygen - O 2  20,95 volumetric %  Gas without taste and smell  In firm and liquid phase is blue  Very reactive element (reactions are mostly exotermic)  Its one of the most importatnt elements in the air  its vital for all living organisms  oxygen supports burning  Boiling point -183°C  Melting point - 218°C  In steel bottle with blue strip

8. Elements in the Atmosphere Ozone – O 3  In 25 kilometer above Earth is ozone layer which absorbs ultraviolet light  It‘s a gas with blue colour and bad smell  In liquid phase is dark blue  In higher concentration is deleterious for us  Ozone is explosive  Boiling point - 111,9°C  Melting point - 192,5°C

9. Elements in the Atmosphere nitrogen - N 2  78,08 volumetric %  Gas without taste and smell  Light gas. Lighter than air  little reactive element. Nitrogen has strong structure  Its one of the most importatnt biogenous elements.  It is part of albumin and amino-acid  Boiling point - 195,8°C  Melting point - 210°C  In steel bottle with green strip

10. Elements in the Atmosphere Carbon dioxide – CO 2  0,033 volumetric %  It‘s not toxic  above concentration 10% makes sleepiness till death  in higher concentration makes burn  Boiling point -78,5°C  Melting point - 56,6°C

11. Elements in the Atmosphere Water vapor – H 2 O (g)  Vapour is only compound which hasn‘t constant value of percentage in air. Its value changes with places and season  water is important for life  transport of vital and waste matters

12. Words into dictionary To eště dodělam :-)))))))