Reference Article

from Wikipedia, the free encyclopedia

Altitude

Altitude is the elevation of an object from a known level or datum.

Common datums are mean sea level and the surface of the WGS-84 geoid, used by GPS.

In the United States and the UK aviation altitude is usually measured in feet.

Everywhere else in the world the altitude is measured in metres.

Atmospheric pressure decreases as altitude increases.

This principle is the basis of operation of the pressure altimeter, which is an aneroid barometer calibrated to indicate altitude instead of pressure.

It is the fall in pressure that leads to a shortage of oxygen (hypoxia) in humans on ascent to high altitude.

Note: This article excerpts material from the Wikipedia article "Altitude", which is released under the GNU Free Documentation License.

See the following related content on ScienceDaily:


Related Stories


Share This



Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins