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.
Mt. Everest is always covered in snow and ice. Many successful climbs to the summit happen in May. This is because the weather conditions are more favorable. The temperature on the mountain gets well below freezing at - 80oF (- 62oC) and the wind can blow at speeds of 200 mph (322 Km/hr). The air surrounding the top of the mountain is very thin.