I pay $30/month
No you don't.
What is the amortized true cost of your battery life.
Even if the electricity was free, it will never be cheap if it comes through a battery. Certainly never cheaper than hydrocarbon fuel.
> And all you have to do is close the door and turn the valve on.
Idiot. A large cylinder holds perhaps 80 cubic feet at 1 bar. Calculate the volume of a small room and you'll see that dumping 80 cu ft of inert gas into a room would hardly affect oxygen concentration.
Consider why that large cylinder of CO2 for the soda fountain in every restaurant and convenience store is not treated like an asphyxiation hazard if it were to leak. And CO2 is not inert like N2.
It is an astonishing, breathtaking failure when viewed with any expertise in how things should be done. You log in and the screen just turns blank with no error message. Or you get an error message that literally just says "Error!" in red and nothing more. Or it gives an error that indicates what can't be the true cause. Or it says we're too busy
Here is an acid-core example: every single user has to confirm via email. Yet the email is flat-out RFC-violating non-compliant, and can't be read in email readers that don't know how to handle this non-conformity. Specifically, this violation appears in the email headers:
Received: from . . . service.govdelivery.com
This is not an example of bad Java, but it does show the kind of foolishness passing for system-building everywhere you look. This garbage came from govdelivery.com who are apparently the choke point for the entire system. If they fail, or if you fail to deal with them, you are SUNK.
They do have a pretty girl smiling at you from the home page. Puh-leeze.
These are not bugs or glitches or the overwhelm of success. This thing is utterly defective. A FAILURE. One must question whether it will ever work, and if it won't have to be abandoned for a do-over. Nobody expected a smooth rollout, but this is head-slapping incompetence.
And the law is, you must succeed with it, or ELSE! You cannot mail in forms, or call on the phone, to get this done. It all happens on the Web.
And when has the federal government ever appropriated non-government technology and property in this way, and used it as the sole means to enforce something against the citizenry? With the income tax, they at least give you the paper and a post office to send it back and forth. The government will depend completely on the Internet now to keep you from being fined or put in jail?
Purple fringes like this are not due to lens coatings or sapphire windows. Nor are they due to lens flare, flare being due to internal surface reflections, so it is wrong to call it a purple flare. Strictly speaking, it is a chromatic aberration, compounded with some coma effects.
The cause is simply infrared (IR) light being imaged by the image sensor. The lens is highly corrected to sharply focus visible light, but such corrections result in severe aberrations in focus for for any light outside the visible. These aberrations worsen with wider angles, that is, the farther out toward the edge.
Of course there is an IR blocking filter in the lens, but it is not perfect. A very small proportion of the IR does get through, but not enough to normally be imaged. However, when you have an severely bright highlight in the scene that is overexposed on the edge of the frame, the light itself will be "blown out" (pixels all white), but abberant unfocused IR rays will form a fringe. This fringe is purple because that is the false color that IR light yields in an RGB sensor. This fringe is not blocked by the IR filter because the highlight is far more intense (potentially by huge factors) than the exposure for the rest of the scene, so even 99.99 percent IR blocking filter lets through enough rays that when aberrated show up as a bright fringe.
Example from a Sony DSC-F828. Note the camera flash reflections from the shiny trophy at the edge of the frame have purple fringes, while the reflection off the glass near the center of the frame does not.
This problem only appears when you have a highly corrected lens, a high-resolution sensor, a high-speed-wide-angle lens, less-than-perfect IR filtering, and a scene of high spatial contrast at the edges. That's why it doesn't appear in most cameras, because few cameras are so high-performance in all of those areas at once.
Fixing the problem can be done by reducing the performance in one or more of those areas. Or you can design even better optics, but that is difficult to implement in a compact size like a phone requires, because it takes bigger bits of glass and more of them. You can also correct in firmware or software.
So the yield multiplier is going to have to be pretty big before this becomes profitable.
Interchangeable parts won't.