This document discusses the properties of air and its components. It contains information about the composition of air, including that it is a mixture of nitrogen, oxygen, carbon dioxide, water vapor and other gases. It also describes some key properties of these components, such as oxygen supporting combustion, nitrogen being needed by plants, and carbon dioxide being absorbed by plants during photosynthesis. The document further explains how windmills and air pressure demonstrate properties of air through hands-on activities.

1. CLASS 6 SCIENCE CHAPTER
15 AIR AROUND US
Made by
Hetanshee

2. How do
this firki
work?

3. How do
this kite
fly?

4. This is all
because
of Air.

5. You all might
have
experienced
cool breeze
during a day.

6. This air balloon also
works on simple
principle of air.

7. Moving air is also wind.
We can find direction of air with help of wind vane.

8. Let us learn
some
properties of
air:-

9. Some properties of air is:-
 Air is a mixture of substances.
 Air is colorless, tasteless, odorless and gaseous substance.
 It occupies space.
 Air has weight and exerts pressure in all directions.
* In order to understand various properties, let us try them.

12. Aim
To show that air exerts pressure.
Method
1. Take a glass and fill it only 1/3 of it with water.
2. Cover the mouth of the glass with an index card.
3. Now hold the card in place and invert the class over sink and remove you hand from the card.
Conclusion and Observation
The card sticks to the glass. This is due to air pressure. The air outside exerts an upward pressure
on the index card. The air pressure is more than the weight of the water in the glass.

13. Activity to prove air support
burning

14. Lets
recall

15. Nitrogen
Carbon Dioxide,
water vapour, other
gases and dust
Oxygen
What is air made up
of?

16. Now let us see the properties
of each gases

17. Properties of
Nitrogen
N2
Needed by Plants to make Protein
Do not support burning Slightly soluble in water
Not essential for breathing

18. Properties of
Oxygen
O2
Supporter of Combustion
Essential for respiration Slightly soluble in water
Poor conductor of heat and electricity

19. Properties of
Carbon-Dioxide
CO2
Neither burns nor
supports burning
Slightly sour in taste Moderately soluble
in water
Green plants need
CO2 to make food

20. Properties of
Smoke
Smo
ke
It cause many
respiratory disease
It is always harmful Produced by burning
of fuels
Consists of fine
carbon particles and
some gases

21. How is oxygen in
the Atmosphere
replaced?
In chapter 7, We learnt about
Photosynethesis. In this process plants make
their own food and oxygen is produced along
it. Plants inhale carbon-dioxide and exhale
oxygen .
The balance of oxygen and carbon dioxide in
the atmosphere is maintained through
respiration in plants, animals and Human

22. LAYERS OF
Layers of
Atmosphe
re

23. Windmill
• A windmill is a structure that converts wind
power into rotational energy by means of vanes
called sails or blades.
 The wind makes windmill rotate.
 The windmill is used to draw water from tube
wells and to run flour mills.
 Windmills are also used to generate electricity.
 It is also termed as wind pumps, wind turbines,
etc.