EAPS 10200 Lecture 9: EAPS 102 WEEK.9
8 Oct 2017
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Document Summary
Water in the air: water vapor (water as a gas) is a common component of the atmosphere. It makes up anywhere from 0. 1 4. 0 % by volume of the atmosphere. In many ways water vapor is the most important gas next to oxygen. Pressure: pressure is defined as force spread over an area. Mathematically pressure is expressed as: pressure = / Each collision exerts a small force on a surface which then becomes a pressure. In the atmosphere there are a number of different atoms/molecules so each one is called a partial pressure. Vapor pressure: at a gas/liquid boundary energetic particles in the liquid may gain enough energy to escape the liquid and become a gas particle. Likewise a gas particle may lose enough energy and fall back into the liquid. If there already too many gas particles the escaping liquid particle will collide with a gas particle, lose energy and fall back into the liquid.
