Air is approximately what composition by volume?
a) 79% N² and 21% CO²
b) 79% O² and 21% N²
c) 79% N² and 21% O²
d) 79% CO² and 21% O²
e) 79% H² and 21% H²O vapour
Answer: C
Air is approximately what composition by volume?
a) 79% N² and 21% CO²
b) 79% O² and 21% N²
c) 79% N² and 21% O²
d) 79% CO² and 21% O²
e) 79% H² and 21% H²O vapour
Answer: C