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

Illustration: Role & Presence of Air

Mayank