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CHAPTER 15 AIR. CLASS VI. AIR IS PRESENT EVERY WHERE AROUND US. MOVING AIR IS CALLED WIND. ACTIVITY: An empty bottle is inverted and dipped under water. Water does not enter inside bottle because the space inside the bottle is filled with air.

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Chapter 15 air

CHAPTER 15 AIR

CLASS VI


Air is present every where around us
AIR IS PRESENT EVERY WHERE AROUND US.

  • MOVING AIR IS CALLED WIND.


  • ACTIVITY:

  • An empty bottle is inverted and dipped under water.

  • Water does not enter inside bottle because the space inside the bottle is filled with air.

  • On tilting, air goes out of the bottle.Now water enters the bottle.

  • AIR OCCUPIES SPACE


Properties of air
PROPERTIES OF AIR

  • AIR HAS NO COLOUR. IT IS TRANSPARENT.

  • THE ENVELOPE OF AIR AROUND EARTH IS CALLED ATMOSPHERE.

ATMOSPHERE



  • AIR IS A MIXTURE OF GASES. thickness of air becomes less .

    COMPOSITION OF AIR -

    * NITROGEN -78%

    * OXYGEN -21%

    * CARBONDIOXIDE - 0.04%

    * WATER VAPOUR

    * DUST &SMOKE

OTHER S


Water vapour
WATER VAPOUR thickness of air becomes less .

WATER VAPOUR IN AIR IS AN IMPORTANT PART OF WATER CYCLE


Oxygen
OXYGEN thickness of air becomes less .

  • HELPS IN BURNING

  • ESSENTIAL FOR BREATHING


  • ACTIVITY: thickness of air becomes less .

  • TAKE WATER IN A CONTAINER AND HEAT IT.

    WE OBSERVE TINY BUBBLES ON THE SURFACE OF VESSEL , AFTER SOME TIME.

    THESE BUBBLES COME FROM AIR DISSOLVED IN WATER.


OXYGEN PRESENT IN AIR IN BETWEEN SOIL PARTICLES IS USED BY SOIL ORGANISMS.

  • OXYGEN DISSOLVED IN WATER IS USED BY AQUATIC ORGANISMS



Air is essential for burning activity
AIR IS ESSENTIAL FOR BURNING SOIL ORGANISMS.ACTIVITY:


Nitrogen
NITROGEN SOIL ORGANISMS.

  • NITROGEN DOES NOT SUPPORT BURNING.

  • IT IS AN IMPORTANT PLANT NUTRIENT.


Carbondioxide
CARBONDIOXIDE SOIL ORGANISMS.

  • RELEASED IN THE ATMOSPHERE DURING RESPIRATION ,BURNING, DECOMPOSITION etc.


Carbondioxide1
CARBONDIOXIDE SOIL ORGANISMS.

  • USED BY PLANTS FOR PHOTOSYNTHESIS.


Carbondioxide2
CARBONDIOXIDE SOIL ORGANISMS.

  • IT CAN EXTINGUISH FIRE.


DUST SOIL ORGANISMS.

  • DUST PARTICLES ARE PRESENT IN AIR.

  • Hairs present in nasal cavity prevent the dust particles from entering into the respiratory system.


Smoke
SMOKE SOIL ORGANISMS.

  • RELEASED BY VEHICLES, FACTORIES, KITCHEN

    BURNING OF OTHER MATERIALS.

  • CONTAIN HARMFUL GASES LIKE , OXIDES OF NITROGEN, SULPHUR, CARBON etc.



Oxygen cycle
OXYGEN CYCLE BRING IT CLOSER TO THE BIRDS.

PHOTOSYNTHESIS

RESPIRATION

[CARBONDIOXIDE]

[OXYGEN]


Uses of air
USES of AIR BRING IT CLOSER TO THE BIRDS.


Fill in the blanks
FILL IN THE BLANKS BRING IT CLOSER TO THE BIRDS.

MIXTURE

  • 1.AIR IS A ----------------------OF GASES.

  • 2.THE ENVELOPE OF AIR AROUND EARTH IS--------------.

  • 3.THE MAJOR CONTENT OF AIR IS -----------------GAS.

  • 4. --------------------GAS IS ESSENTIAL FOR BURNING.

  • 5. THE GAS USED FOR PHOTOSYNTHESIS IS -----------------.

  • 6.EARTH WORM BREATH AIR PRESENT IN ------------

  • 7.FISHES BREATH OXYGEN PRESENT IN --------------.

  • 8.---------------------------GAS CAN EXTINGUISH FIRE.

ATMOSPHERE

NITROGEN

OXYGEN

CARBONDIOXIDE

SOIL

WATER

CARBONDIOXIDE


Say true or false
SAY TRUE OR FALSE BRING IT CLOSER TO THE BIRDS.

TRUE

FALSE

  • 1.MOVING AIR IS CALLED WIND.

  • 2.AIR DOES NOT NEED SPCE TO OCCUPY.

  • 3.CARBONDIOXIDE SUPPORTS BURNING .

    4. EARTHWORMS BREATHE AIR PRESENT IN SOIL.

  • 5. PLANTS AND ANIMALS DEPEND ON EACH OTHER FOR EXCHANGE OF OXYGEN AND CARBONDIOXIDE FROM AIR.

    6.HAIRS INSIDE THE NASALCAVITY FILTER CARBONDIOXIDE PRESENT IN AIR.

FALSE

TRUE

TRUE

FALSE


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