Definition of "vapor pressure" []

• The pressure exerted by a vapor in equilibrium with its solid or liquid phase. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He expected the liquid to ooze out in the asteriod's feeble gravity, but its vapor pressure must have been high, for it sprayed out in a heavy stream."