Define tidal voulume and give its amount in ml:

Amount of air inhaled or exhaled per breathing stroke is called as tidal volume. Tidal volume is 400 ml for women while for men it is 500 ml.

Explanation:

In respiration, tidal volume is defined as the volume of air that a person inhales or exhales  in one stroke of normal breathing.  

The tidal volume varies in adult men and women.  In resting condition,  tidal volume is 400 ml for women while for men it is 500 ml.

This tidal volume varies with the requirement of the body. During intense physical exercise the amount of gas intake increases in order to full fill the requirement of body and hence the tidal volume increases.