Download - CHAPTER 15 AIR
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CHAPTER 15 AIRCLASS VI
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AIR IS PRESENT EVERY WHERE AROUND US.
• MOVING AIR IS CALLED WIND.
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• 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
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PROPERTIES OF AIR• AIR HAS NO COLOUR. IT IS TRANSPARENT.• THE ENVELOPE OF AIR AROUND EARTH IS
CALLED ATMOSPHERE.
ATMOSPHERE
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• As we go higher and higher, above the suface of earth, the thickness of air becomes less .
• At the top of high mountains, oxygen is less.
• Mountaineers carry oxygen cylinders with them.
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• AIR IS A MIXTURE OF GASES.
COMPOSITION OF AIR - * NITROGEN -78% * OXYGEN -21% * CARBONDIOXIDE - 0.04% * WATER VAPOUR * DUST &SMOKE
OTHER S
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WATER VAPOURWATER VAPOUR IN AIR IS AN IMPORTANT PART
OF WATER CYCLE
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OXYGEN
• HELPS IN BURNING • ESSENTIAL FOR BREATHING
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• ACTIVITY:• 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.
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• OXYGEN DISSOLVED IN WATER IS USED BY AQUATIC ORGANISMS
• OXYGEN PRESENT IN AIR IN BETWEEN SOIL PARTICLES IS USED BY SOIL ORGANISMS.
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• EARTHWORMS COME OUT OF THEIR BURROWS DURING RAIN .
WATER occupis all spce in between the soil particles ,replacing air.Eatrh worms find it difficult to breath.
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AIR IS ESSENTIAL FOR BURNINGACTIVITY:
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NITROGEN
• NITROGEN DOES NOT SUPPORT BURNING.• IT IS AN IMPORTANT PLANT NUTRIENT.
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CARBONDIOXIDE
• RELEASED IN THE ATMOSPHERE DURING RESPIRATION ,BURNING, DECOMPOSITION etc.
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CARBONDIOXIDE• USED BY PLANTS FOR PHOTOSYNTHESIS.
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CARBONDIOXIDE• IT CAN EXTINGUISH FIRE.
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DUST
• DUST PARTICLES ARE PRESENT IN AIR.
• Hairs present in nasal cavity prevent the dust particles from entering into the respiratory system.
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SMOKE
• RELEASED BY VEHICLES, FACTORIES, KITCHEN BURNING OF OTHER MATERIALS.• CONTAIN HARMFUL GASES LIKE , OXIDES OF
NITROGEN, SULPHUR, CARBON etc.
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• LONG CHIMNEYS OF FACTORIES TAKES THIS SMOKE AWAY FROM US BUT BRING IT CLOSER TO THE BIRDS.
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OXYGEN CYCLE
PHOTOSYNTHESISRESPIRATION
[OXYGEN][CARBONDIOXIDE]
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USES of AIR
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FILL IN THE BLANKS• 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.
MIXTURE ATMOSPHERE
NITROGENOXYGEN
CARBONDIOXIDE
SOIL
WATERCARBONDIOXIDE
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SAY TRUE OR 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.
TRUEFALSE
FALSE
FALSE
TRUE
TRUE
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