The Martian Read Online Free PDF Page A

with a nice, isolated pop-tent. Setting up the equalizer hose was trivial (for once I’m using equipment the way it was designed to be used). Then, after a few trips through the airlock (with the air-loss automatically equalized by the Hab) I got the dirt in.
    I repeated the process for the other tent. Everything went really easily.
    Sigh… water.
    In high school, I played a lot of Dungeons and Dragons. (You may not have guessed this Botanist / Mechanical Engineer was a bit of a nerd in high school, but indeed I was). In the game I played a Cleric. One of the magic spells I could cast was “Create Water”. I always thought it was a really stupid spell, and it never came up. Boy what I wouldn’t give to be able to do that in real life right now.
    Anyway. That’s a problem for tomorrow.
    For tonight, I have to get back to “Three’s Company.” I stopped last night in the middle of the episode where Mr. Roper saw something and took it out of context.
     
     
    LOG ENTRY: SOL 30
     
    I have an idiotically dangerous plan for getting the water I need. And boy do I mean *dangerous*. But I don’t have much choice. I’m out of ideas and I’m due for another dirt-doubling in a few days. When I do the final doubling, I’ll be doubling on to all that new soil I’ve brought in. If I don’t wet it first, it’ll just die.
    There isn’t a lot of water here on Mars. There’s ice at the poles, but they’re too far away. If I want water I’ll have to make it from scratch. Fortunately, I know the recipe: Take hydrogen. Add oxygen. Burn.
    Let’s take them one at a time. I’ll start with oxygen.
    I have a fair bit of O2 reserves, but not enough to make 250 liters of water. Two high-pressure tanks at one end of the Hab are my entire supply (plus the air in the Hab of course). They each contain 25 liters of liquid O2. The Hab would only use them in an emergency; it has the Oxygenator to balance the atmosphere. The reason the O2 tanks are here is to feed the spacesuits and rovers.
    Anyway, the reserve oxygen would only be enough to make 100L of water (50L of O2 makes 100L of molecules that only have one O each). That would mean no EVAs for me, and no emergency reserves. And it would make less than half the water I need. Out of the question.
    But oxygen’s easier to find on Mars than you might think. The atmosphere is 98% CO2. And I happen to have a machine whose sole purpose is liberating oxygen from CO2. Yay Oxygenator!
    One problem: The atmosphere is very thin. About 1/90th the pressure on Earth. So it’s hard to collect. Getting air from outside to inside is nearly impossible. The whole purpose of the Hab is to keep that sort of thing from happening. The tiny amount of Martian atmosphere that enters when I use an airlock is laughable.
    That’s where the MAV fuel plant comes in.
    My crewmates took the MAV away weeks ago. But the bottom half of it stayed behind. NASA is not in the habit of putting unnecessary shit in to orbit. It left the landing gear, ingress ramp, and fuel plant behind. Remember how the MAV made its own fuel with help from the Martian atmosphere? Step one of that is to collect CO2 and store it in a high pressure vessel. Once I get that hooked up to the Hab’s power, it’ll give me half a liter of liquid CO2 per hour, indefinitely. After 5 days it’ll have made 125L of CO2, which will make 125L of O2 after I feed it through the Oxygenator.
    That’s enough to make 250L of water. So I have a plan for oxygen.
    The hydrogen will be a little trickier.
     
    I considered raiding the hydrogen fuel-cells, but I need those batteries to maintain power at night. If I don’t have that, It’ll get too cold. I could bundle up, but the cold would kill my crops. And each fuel cell only has a small amount of H2 anyway. It’s just not worth sacrificing so much usefulness for so little gain. The one thing I have going for me is that energy is not a problem. I don’t want to give that up.  
    So I’ll have to go a