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Wherever you may be when you read this a column of air at least 50 miles high is pressing down upon you. Although you do not feel it, this column of air is exerting a pressure equal to 15 lbs on every square inch of your body. People who climb high mountains where the air is thin find it very difficult to live and breathe. On the top of Mount Everest (30,000 feet) the pressure in much less than one - fifth what it is at sea - level and it is almost impossible to live at such a height even for a short time. Even at sea -level the pressure is not the same at all places