why do mountaineers carry oxygen cylinders with them ?
how will you show that air contains water vapour?
What is the source of rain water?
hw is the balance of oxygen and carbon dioxide is maintained in the atmosphere?
how does dust particles in air help in causing rain?
how do modern industrial chimneys help to reduce air pollution?
Why does a
lump of cotton wool shrink in water?
why do bubbles come out of a lump of soil when it is in water?
activities that are possible due to the presence of air.
how is the oxygen in the atmosphere replaced?
why don't we feel the pressure exerted by atmosthere?
Why are Paheli and Boojho so s-t-u-p-i-d?
why during an incident of fire, one is advised to wrap a woollen blanket over the burning object ?????????
what are bad effects of a mobile phone on our body?
Which gas has the highest percentage in Air ?
Why do you think air becomes thinner higher up?
1) Why do traffic policeman wear masks at crowded crossroads??
2) How do plants and animals maintain the balance of oxygen and CO2 in the air ( or in theatmosphere)???
WHY IS AIR CLEAN AFTER IT RAINS?
why the transparent glass of windows if not wiped off regularly appears hazy
What is inert gas ?
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