Comments by "Tony Wilson" (@tonywilson4713) on "BBC News"
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@jonnyhatter35 No problems mate.
Here's a slightly longer version of the subject.
I did aerospace engineering and back in college we had an alum who worked at NASA visit and do a special lecture one Friday. He'd just done a project where they assessed the viability of terraforming Mars.
He introduced us to what I call planetary mechanics - the basics numbers of what you need to do. The making it all work as a functioning atmosphere is what I call planetary dynamics because that's about dynamic systems as things that move rather than just the basic numbers.
So in planetary mechanics you look at things like size of the planet and how much air you need if you want a breathable atmosphere. The numbers are massive because planets are massive.
If we go to an air conditioning company they'll ask how many cubic meters the house or building has and we'd be talking maybe a few hundred or a few 1000 for an office block. The quick way to estimate that is to look at the floor space of your house and multiply by 2.5 because most rooms are about 2.5 meters heigh. So if your apartment has 200m2 of floorspace you have about 500m3 of volume. For an office block with 5,000m2 its about 12,500m3.
But the Earth has 500,000 square kilometers of floor space that's 500,000,000,000 square meters. So just for the first kilometer of air around us its 500,000,000,000,000m3 (500 trillion). At about 1.2kg/m3 that's about 600 billion metric tons of air. That's just the first kilometer above sea level and there's a lot more above that.
Its one of the main reasons its so hard for engineers and scientists to communicate what we've actually done to our planet. The numbers are so large most people can't get their heads around it. How do you get average citizens to consider 600billion tons of air when for their basic daily life air weighs nothing?
I can do this because I met the right guy back when who introduced this subject.
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