Question

.A fixed air is in biology​

Answer 1

Answer:

Carbon dioxide is known as fixed air by Dr. Joseph Black because it can be absorbed or fixed by strong base.

So the correct answer is 'Carbon dioxide'.

Answer 2

Answer:

Here's your answer

Explanation:

To combine or charge with gas; usually with carbonic acid gas, formerly called fixed air. His sparkling sallies bubbled up as from aerated natural fountains. ... To supply or impregnate with common air; as, to aerate soil; to aerate water.