1. Atmosphere Presentation by Jerry Pořízka & Lucy Paříkova

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 – N2 • Oxygen – O2 • Carbon dioxide – CO2 • Water vapor – H2O (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 • NH3 • H2O • CO2 • Synthesis of formaldehyde → oxygen: H2O + CO2→ HCOH + O2 • By the activites of UV radiation ozone was formed

5. Atmosphere today • Today chemical structure of atmosphere is: • N2 78,08% • O2 – 20,496% • CO2 – 0,033% • H2O (g) • Noble gasses – mostly Ar – 0,934% • Thanks to photosynthesis oxygen is produced • 6CO2 + 12H2O → C6H12O6 + 6O2 + 6H2O • Today air is polluted by harmful gasses: • H2S, Cl2, N2O, NO2 , SO2, 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 - O2 • 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 – O3 • 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 - N2 • 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 – CO2 • 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 AtmosphereWater vapor – H2O (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 :-)))))))