Concrete Calculator - volume vs. weight. Calculator for weight of concrete amounts, between weight and volume equivalent measurements from lb^3, yd^3, cubic meter of concrete into mass measures in pounds, kilograms, tons.
Climbers use supplemental oxygen to give them an edge while pushing to the summit of a mountain like Everest at 8850 meters. At that altitude, the available oxygen is 33% of that at sea level. It is like running up a staircase while holding your breath 2 out 3 steps. To summit Everest without using any supplemental oxygen anytime on the climb is rare, it is estimated less than 100 out of the over 6500 summits have been accomplished in this pure manner.
The effects of high altitude on humans are considerable. The percentage saturation of haemoglobin with oxygen determines the content of oxygen in our blood. After the human body reaches around 2,100 m (7,000 feet) above sea level, the saturation of oxyhemoglobin begins to plummet.ountain medicine recognizes three altitude regions that reflect the lowered amount of oxygen in the atmosphere: 1  High altitude = 1,500â3,500 metres (4,900â11,500 ft). 2  Very high altitude = 3,500â5,500 metres (11,500â18,000 ft). 3  Extreme altitude = above 5,500 metres (18,000 ft).