Several wineries feature their altitude level on their labels along with their alcohol level.
Most people who live near sea level experience mild altitude sickness starting at about 5, 000 feet.
At a simplistic level by nature of altitude, climate, geography and geology there are fundamental differences between nations.
The team simply is not acclimatised to the 5, 000 feet altitude here having only returned from sea level on Sunday and the bowlers were all flagging in the final session.
First, subtraction is a ground level strategy, not a high altitude theory, and is what people want me to talk about in speeches and seminars.
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The air pressure is also now closer to what is normal in Denver, Colorado -- the mile-high city at 5, 280ft -- than the traditionally higher, and more mountaintop-like standard of 8, 000ft above sea level, sparing fliers from the mild altitude sickness that can be experienced when flying a long distance.
At ground level ozone is a dangerous pollutant, but at altitude it blocks the passage of harmful ultraviolet light.
But high-altitude carbon emissions are reckoned to be more damaging than low-level ones, although nobody is sure by exactly how much.
Located in one of the driest regions on earth at an altitude at which the atmosphere is 50 percent thinner than at sea level, ALMA is the highest construction project in the world and arguably the most challenging.
Fresh from constructing a sea-level canal through the flat Egyptian sand, de Lesseps was determined, without having set foot in Panama and after only the vaguest of topographical studies, that his project through the mountainous central American isthmus would also be a sea-level canal, requiring no locks to cope with changes in altitude.
At Sunday's jump altitude, the air pressure is less than 2% of what it is at sea level, and it is impossible to breathe without an oxygen supply.
It traverses oxygen-starved, earthquake-prone terrain that for most of the way is over 4, 000 metres (13, 120 feet) above sea level and rises to 5, 072 metres not far off the altitude of Mount Everest's base camp.
All the players should be at full tilt now and they won't be able to hide behind the effects of altitude as an excuse for not performing well, because they are playing the Sharks at sea level in Durban.
It offers remarkable fuel efficiency--more on that in a minute--but the tradeoff is that it takes 27 minutes to get from sea level to 41, 000 feet, which is both the Mustang's maximum operating altitude and its most fuel-efficient.
Inside the lodges, trekkers rest up ahead of their final climb, conserving their strength and yet still burning energy just trying to breathe and function at such an altitude -- at 4, 800m, oxygen levels are only about 55% of those at sea level.
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