By the Bernoulli principle and simple physics, the fresh air will tend to push pockets of older air out of the case (through random holes and crevices like the 5.25" bays and the expansion slots) as they move towards the lower pressure outside. Since there is more air inside the case than outside, the density of particles is greater inside, and therefore the pressure is greater inside. The theory behind this is that having more fans (or more powerful fans) blowing air in creates a positive pressure gradient between the inside of the case and its surroundings. You will have a "negative pressure" system if more of those fans are exhaust than intake. If your fans all have the same CFM rating, then you will have a "positive pressure" system if you have more intake fans than exhaust fans. Positive and Negative Pressures - What Are They?īasically, a positive pressure system means that you have more air coming into your case than being exhausted out of your case. The physics behind all of this is quite fundamental, and worth researching if you are interested, but what is important to know right now is that air moves from higher to lower pressures. This gives rise to the fact that air moves from high pressure to low pressure. Central to fluid dynamics is Bernoulli's principle, which simply states that if the pressure (or potential energy) of a fluid decreases, its speed increases, and vice versa (which is simply a restatement of conservation of energy and Newton's second law, the more universal physical laws). Air, as you should know, is a fluid, and its movement is therefore governed by the laws of fluid dynamics. Well lucky for you, I am a trained physicist, and I'm going to attempt to straighten it all out in this post.Ī Brief Overview of the Physics of Airflow (for dummies)Īirflow, or more specifically fluid flow, is governed by the laws of fluid dynamics, which are simply just restatements of physical principles such as conservation of energy and Newton's laws, applied to fluids. I believe this is mostly due to people not quite understanding the science and reasoning behind it all. Despite the huge number of discussions, there does not seem to be any agreement on which is the best. Central to this is the debate between "negative pressure" (more air exhaust than intake) and "positive pressure" (more air intake than exhaust) systems, and which configuration provides the best cooling for your PC and its individual components. Most of the talk is about what is the best fan configuration, and everybody seems to have their own opinion without knowing any of the science behind it. I've seen a lot of talk around the internet regarding PC airflow. Pick, Assemble and Install: Video Guide.No intentionally harmful, misleading or joke advice. ![]() No excessive posting (more than one submission in 24 hours).No selling, trading or requests for valuation.No self-promotion, advertising, begging, or surveys. ![]()
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