Question

how is air useful to us

Answer 1

Animals live by aerobic respiration and need to breathe the oxygen in the air. In the human body, the lungs put oxygen into the blood, and send back carbon dioxide to the air. Plants need the carbon dioxide in the air to live. ... Pneumatics use airpressure to move things

Answer 2

HELLO MY DEAR FRIEND

LIVING THINGS CANNOT SURVIVE WITHOUT AIR.
AIR IS NECESSARY FOR BREATHING AND COMBUSTION.
THE EARTH IS SURROUNDED BY AN ENVELOPE OF AIR IS CALLED ATMOSPHERE. 

NOBEL GASES-

element             symbol 
name 

HELIUM   -           He
NEON      -            Ne
ARGON   -           Ar
XENON   -           Xe

ATMOSPHERE CONTAINS ( N2 AND O2) NITROGEN AND OXYGEN ALONG WITH NOBEL GASES.

COMPOSITION OF AIR -

N2                                                   78% 
O2                                                   21%
Co2                                               0.03% 
INERT GASES                                0.9%
WATER VAPOUR                         VARIES 
IMPURITIES AND                         VARIES 
DUST PARTICLES     

CHARACTERISTICS OF AIR - 

THE AIR VARIES FROM PLACE TO PLACE FROM TIME TO TIME.
PERCENTAGE OF WATER VAPOUR IN THE AIR DEFIANCE ON BOTH PLACE AND SEASON.
NO DEFINITE BOILING POINT FOR LIQUID AIR. ( bph2O -----------> 100%

IMPORTANCE PROPERTIES OF AIR -

AIR IS A COLOURLESS GASEOUS SUBSTANCE.
AIR OCCUPIES SPACE.
AIR USUALLY HAS SOME SPEED.
AIR HAS TEMPERATURE.
AIR HAS VOLUME.
AIR USUALLY CONTAINS SOME WATER VAPOUR.

I HOPE THIS WILL HELP'S U.................*-*

# SWETHAPAVS #