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Understanding air density and its effects

By Jack Williams,

In simple terms, density is the mass of anything – including air – divided by the volume it occupies.

In the metric system, which scientists use, we usually measure density in terms of kilograms per cubic meter.

The air’s density depends on its temperature, its pressure and how much water vapor is in the air. We’ll talk about dry air first, which means we’ll be concerned only with temperature and pressure.

In addition to a basic discussion of air density, we will also describe the effects of lower air density – such as caused by going to high altitudes – on humans, how humidity affects air density – you might be surprised – and the affects of air density of aircraft, baseballs, and even racing cars.


Coast Flight Academy is excited to announce that we have the I-20 document capabilities!

This means that we are, now, able to flight train international students, from all over the world, in our Professional Pilot Program.

The I-20 is a document through which the Student Exchange Visitor Program (SEVP) and U.S authorities differentiate between individuals who are in the United States for legitimate academic pursuits, and those who are not.

Coast Flight Academy is the only Cirrus Training Center in San Diego and we offer one of the best pilot training environments in the world so students can prepare themselves for a career in the aviation industry. Students enrolled in Coast Flight Academy’s Professional Pilot Program will receive all of their licenses/ratings, including Commercial Multi-Engine, in a matter of only 9 months. Furthermore, students will have the opportunity to experience flying in every imaginable weather condition, fly in some of the busiest airspaces in the world, learn from Cirrus certified instructors and fly to a wide variety of airports in places such as Las Vegas, Tahoe and even Mexico

Today is the time for you to take the step to realize your vision… and begin a new career path that will take you to new heights. If you or someone you know is interested in the Coast Flight Academy’s Professional Pilot Program. Contact us today as enrollment is limited, 858-279-4359.

For more information about the I-20 and the Visa process, please check out

Notice Number: NOTC2092

In an effort to reduce pilot deviations in the Washington DC Special Flight Rules area, the FAA now has a regulatory training requirement for any pilot flying VFR within a 60 nautical mile radius of the Washington, DC VOR/DME. (more…)


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The term “mountain flying” may conjure up romantic images of aircraft flying over a spectacular mountain ranges with the orange and yellow sunsets gleaming over the horizon.  Such images of mountain flying are very romantic indeed, however, are quite simplistic as well.  As any pilot, with experience flying in mountainous areas, knows, soaring within this high territory can be far more grueling and dangerous that it appears. (more…)