Qfyilyi

In my world everything is formed from the following fundamental elements. Air, Water, Fire, Earth, Nature and Mana. I wanted my creations to be able to travel faster than the speed of sound with no sonic boom, so I decided that Air would be generated instead of just being present in the empty space.

So when you talk, you generate air with your vocal chords. When there is a breeze, it is a combination of thousands of plants moving in unison to create the breeze. And when it storms it is a mixture of fire from the sun, water and its evaporation and plants moving when hit by water which create great gusts of wind.

Anyway the end result is that Air Friction doesn't really exist. If someone travels faster than 300m/s there is no sonic boom unless they created a huge column of air behind them to propel them that fast in the first place, or they ran into Air that had been generated by someone else.

So I was wondering, if there would be any significant changes to modern society if Air Friction didn't exist. (All I can think of is that ground vehicles might be more efficient and planes would need to operate off a different principle.)

Being able to talk means that air seems to be generated in a manner that affords a pressure wave of some kind - that is to say, that it's not massless. This is a very exotic form of physics, insofar as it would involve a very exotic form of fluid dynamics.

First thing I can think of is that birds wouldn't exist in your world, certainly not birds that merely flap their wings. Birds flap their wings because of air pressure and friction, one of which they no longer have. They may 'whistle' or eject air from the front part of their wings in a manner that generates a form of jet propulsion, but there would be very little benefit to flapping in your physics.

Parachutes would also be far less efficient because they lack the ability to keep sufficient air contained to create a pressure differential that generates the resistance you need to slow down.

Jet engines would be rocket engines in another name, as there would be no air to suck in and push out the back of the engine really quickly. Conversely, propellers and even helicopters just wouldn't work, not in their current engineering incarnations.

Hot air balloons won't work either. As the air dissipates, you're in many ways operating in a vacuum meaning that whatever air you have in the balloon, it's heavier than the 'atmosphere' around you. Mind you, in a 'windy' area, with lots of trees producing breeze, they may just work but they'll be less efficient.

The real winner here is rockets; just as meteors and the like won't be slowed down on their way to Earth, rockets don't have to contend with friction in the air as they're going up. That said, re-entry would be tricky and would rely on having as much fuel for the return journey as you had to use to get up there in the first place (and that's assuming that you don't have to carry the return fuel with you) because you can't rely on air friction to slow you down.

The other winner would be baseball players. Assuming that the turbulence created by the ball (a sphere) is greatly reduced by the lack of friction, pitches would be faster and fly for longer, and hitting the ball out of the park would be a lot easier to do. You'd probably have to have a baseball diamond that turns a home run into a mini marathon.

Guns would be (almost) silent killers so make sure you have strict gun controls in this world. Speaking would be harder as you need to generate the air, so whispering in quiet conversations would actually be easier. Quiet guns and private conversations may in fact lead to a world where intelligence and espionage is an established form of warfare, as opposed to massive armies taking each other on.

This would be an interesting world for many different reasons, but the one thing that you might miss is music, or at least the ability to play it through conventional speakers. I suspect that even playing back recorded music would involve some strange take on rocket propulsion technology.

I doubt complex life would have formed in such a world. If air exerts no force when flowing on objects, it would not move the surface of water bodies, not creating waves.

This would severely limit the gas exchange with the atmosphere, resulting in less available gases for water lifeforms.

Also, there would be no nutrients carried by the wind when blowing land dust over seas and lakes, and with no nutrients such as phosphorus sea plants would not thrive. Fewer or no plants means again fewer or no oxygen for aerobic water organisms.

Consequently, no land dwelling creatures.

Without air all objects in your world would fall at the same rate. If a bowling ball and a feather were dropped at the same time they would hit the ground at the same time.
Without air objects would not heat up traveling at high speeds. A example would be a meteor entering your atmosphere would not burn up like it would in real life.
Without a atmosphere the sky would also be black like the surface of the moon. Things in direct sunlight would burn, and things in the shade would freeze.

No air friction means that anything doing an atmospheric entry will strike the ground with full force.

According to a professor from Cornell University:

Estimates for the mass of material that falls on Earth each year range from 37,000-78,000 tons. Most of this mass would come from dust-sized particles.

A study done in 1996 (looking at the number of meteorites found in deserts over time) calculated that for objects in the 10 gram to 1 kilogram size range, 2900-7300 kilograms per year hit Earth. However, unlike the number above this does not include the small dust particles. They also estimate between 36 and 166 meteorites larger than 10 grams fall to Earth per million square kilometers per year. Over the whole surface area of Earth, that translates to 18,000 to 84,000 meteorites bigger than 10 grams per year. But most meteorites are too small to actually fall all the way to the surface. (This study was led by P. A. Bland and was published in Monthly Notices of the Royal Astronomical Society.)

If that mass of meteorites did not burn up in the high atmosphere, we'd be in trouble.

Just so you know, the slowst of those particles that get destroyed by air friction hit the Earth at speeds in the order of eleven kilometers per second. Most are much faster than that.

Not only it would constantly rain space dust on our heads, it would rain at hypersonic speeds. Any life would only form underground.

Which leads to another problem: air friction takes a lot of energy from sound. Without it, any sound would last much longer. With the closed space of the underground acting as a insanely large array or resonance chambers, any sound would be deafening - and the buildup of energy there would make underground caves shake and collapse.