VITAL CAPACITY.
1. Comparing my vital compactiy to Ashpreet, Monica and Kamalvir, there was a decent gap between ours. Me and Ashpreet got the same capacity, but Monica and Kamalvir's were significantly different. Monicas was almost a whole litre larger and Kamalvir's was almost a whole litre less. I think vital capacites can differ based on a person's activites. E.g, excercising, playing sports, playing instruments. Or even them in general, e.g, height, weight, and sex.
2. According to google, a usual breath is about 500mL, or half a litre. I think our breaths are the volume that they are because lungs are very strong and on average that is how much a person needs to survive.
3. During usual exhalation you're not letting out as much breath as you're capable of. Whereas with forcefully exhaling your breath, you're letting out as much as you are possibly capable of. When you're doing things like exercising/instrument playing/singing, you're exerting air forcefully and not as much as a normal person doing normal breathing would be.
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