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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As we go higher and higher, above the suface of earth, the thickness of air becomes less .
COMPOSITION OF AIR -
* NITROGEN -78%
* OXYGEN -21%
* CARBONDIOXIDE - 0.04%
* WATER VAPOUR
* DUST &SMOKE
WATER VAPOUR IN AIR IS AN IMPORTANT PART OF WATER CYCLE
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.
WATER occupis all spce in between the soil particles ,replacing air.Eatrh worms find it difficult to breath.
BURNING OF OTHER MATERIALS.
LONG CHIMNEYS OF FACTORIES TAKES THIS SMOKE AWAY FROM US BUT BRING IT CLOSER TO THE BIRDS.
4. EARTHWORMS BREATHE AIR PRESENT IN SOIL.
6.HAIRS INSIDE THE NASALCAVITY FILTER CARBONDIOXIDE PRESENT IN AIR.