Vital capacity of lungs is
IRV + ERV
IRV + ERV +TV - RV
IRV + ERV + TV + RV
IRV + ERV + TV
As we have learnt,
Vital Capacity (VC) -
The maximum volume of air a person can breathe in after a forced expiration.
- wherein
This includes ERV, TV and IRV or the maximum volume of air a person can breathe out after a forced inspiration.