NCERT Class 6 Science Chapter 15: Air YouTube Lecture Handouts
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NCERT Class 6 Science Chapter 15: Air
Role & Presence of Air
Windmill
Birds fly
Seeds disperse
Important in water cycle
Weather cock – direction of moving air
👉 Clothes dry
Pages of book flip when fan is on …
👉 Dip empty flask in water and you see bubbles (when vertical water cannot enter but when tilted water enters – air that escapes)
Air is present everywhere and occupies all the available space.
All the vehicles move on tyres which are filled with the compressed air
Air has no color
Air is transparent
Air has weight
Air is present in atmosphere
Air is mixture of gases - water vapor, oxygen (mountaineers carry oxygen) , nitrogen (4⟋5th part and does not support burning) , carbon dioxide in small component, dust and smoke
👉 2 candles are burnt – keep in water beaker with inverted flask – water level rises (as oxygen burns out, candle extinguishes and space is used by water – but water does not fill completely as rest of the gases are left)
👉 Beam of light entering a dark room – shining small particles (dust is present and varies with time and place) – Dust leads to dull flowers and roadside
Fine hair in our nostrils prevent dust from entering (breathing through mouth is harmful)
Boiling water – we see bubbles (air) – water organisms use dissolved oxygen in water
Water when poured in soil displaces air – burrow holes
When it rains heavily water fills up the space
👉 Oxygen is replaced in atmosphere by photosynthesis (interdependence of plants and animals)
Air Pollution – Dust, Smoke, Chemicals and Germs
Prevent Pollution
Create awareness
Prefer biodegradable material
Minimize waste and recycle
Reuse and reduce
✍ Mayank