Vital capacity (VC) = IRV + ERV + TV TV = VC – (IRV + ERV) = 60 mL/kg – (40 mL/kg + 15 mL/kg) = 5 mL/kg TV of an adult mammal of 50 kg body weight = 5 mL/kg × 50 kg = 250 mL TV/min = 250 mL × 20 = 5000 mL Volume of air that lungs displace in 24 hours (TV/day) = TV/min × 60 × 24 = 5000 mL × 60 × 24 = 7,200,000 mL = 7,200 L