G
o
o
g
l
e
×
Please click
here
if you are not redirected within a few seconds.
All
Images
Videos
Books
Maps
News
Shopping
Search tools
Any time
Any time
Past hour
Past 24 hours
Past week
Past month
Past year
All results
All results
Verbatim
Atmosphere
View all
An atmosphere is a layer of gasses that envelop an astronomical object, held in place by the gravity of the object. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low.
Wikipedia
Normal pressure
:
14.7 pounds per square inch