Hawa ek gaseous padarth hai jo prithvi ke chad me payi jati hai. Yah sabse anupaam (invisible) hoti hai aur hamey sans lene mein sahayata karti hai. Hawa, prakriti dwara utpann hoti hai aur bhini-bhini gaseous tatvo ka mishran hota hai jismein nitrogen (78%), oxygen (21%), argon (0.93%), carbon dioxide (0.04%) aur anya anek alp matra mein tatva hote hain.
