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Athena & Ryder - composition of air, When air moves in our…

- - - - Living things living on land obtain oxygen from the air directly
        Living things living in water obtain oxygen that has dissolved in water Oxygen is needed by living things to carry out respiration in order to obtain energy from food
        Oxygen is needed for burning The burning of fuels in the presence of oxygen allows us to cook food, boil water, operate machines or
        Plants release oxygen into the air when they make food by the process of photosynthesis
  - - - Living things release carbon dioxide into the air when they breathe out
        Plants take in carbon dioxide when they carry out photosynthesis
        Carbon dioxide is also released into the air when things burn or decay The exchange of carbon dioxide and oxygen through different processes helps to balance the amount of these two gases in the air
  - - - Argon, helium and neon are rare gases
        Argon is used in light bulbs Helium is used to fill balloons Neon is used in advertising signs
  - - - it is the most abundant gas in the air
        it is used to make fertilisers for plants to grow healthily
        in liquid state,its used to refrigerate during transportation
        it doesn't support burning
  - - - Air also contains dust, microorganisms and chemicals such as sulfur dioxide and carbon monoxide
  - - - Water from the water bodies evaporates to form water vapour in the air Water vapour is also released into the air when living things breathe out The term humidity is used to measure the amount of water vapour in the air The amount of water vapour in the air varies There will be more water vapour in the air on a humid day or at a place near the ocean Water vapour in the air is part of the water cycle
- - - - The process of respiration also produces carbon dioxide and water
        
        This process can be summarised in the following way:food + oxygen→ carbon dioxide + water + energy['+' means 'and', '→' means 'produce']
        
        The living cells in animals and plants carry out respiration in the presence of oxygen most of the time
        
        In humans, oxygen which is needed for respiration is obtained from the air when we breathe in The waste product, carbon dioxide, produced from respiration is removed from our body when we breathe out
        
        We breathe in and breathe out the air with the help of the respiratory system in our body
  - - - It is the main passageway where air enters or leaves our body The fine hair and mucus in the nose trap dirt in the air The mucus also moistens and warms the air entering the nose
    - - It directs air to the air tubes
    - - The windpipe branches into two smaller air tubes They direct air to the lungs
    - - The lungs contain air sacs It allows the exchange of oxygen and carbon dioxide between the air sacs and the blood vessels to take place