THE BREATHE OF LIFE : AIR

Natural Resources - Introduction|What Are These Resources On The Earth?|The Breath Of Life: Air|The Role Of The Atmosphere In Climate Control|The Movement Of Air: Winds|Summary

Exhalation |Breathing In Other Animals|Breathing Under Water|Respiraton In Plant|OMR

Assertion . All terrestrial vertebrates are air -breathers. Reason . They have developed lungs for air breathing an adaptation for land life.

Tidal volume is that volume of air which is inhaled (and exhaled) in one breath by a human during quiet breathing. For a normal man this volume is close to 0.6 litre. 35% of oxygen (in terms of molecular count) gets converted into carbon – di – oxide in the exhaled air. Nearly 21% of the air that we breath in is oxygen. Assume that a man is breathing when the air is at STP and the moisture content of inhaled and exhaled air is same. Estimate the difference in mass of an inhaled breath and exhaled breath.

The air which is breath in and out quietly is called

A human adult breathes in approximately 0*50 dm^(3) of air 1*00 bar with each breath. If an air tank holds 100 dm^(3) of air at 200 bar. How many breaths the tank will supply? Assume that the temperature is 37^(@)C .