AtmospherePresentation by

Jerry Pořízka &

Lucy Paříkova

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

Atmospheric layers

TroposphereTropopauseStratosphereOzonosphereMezosphereThermosphere Ionosphere

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

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,

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

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

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

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

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

Elements in the Atmosphere Water 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

Words into dictionary

• To eště dodělam :-)))))))