The waste products of cellular respiration (not digestion) are CO2 and water. This is happening whether you eat dinner or not. You could fly from LAX to Narita without eating or drinking a thing, and you’d be exhaling CO2 and water vapor the whole time.
“beanbrain,” “Put a sock in it,” “you slime”… is it any wonder that the tone that’s set around here sometimes partakes of insulting or abusive language? I should probably take this to ATMB, and I will.
No, it converts energy. It doesn’t produce it. The sun does that. Photosynthesis traps that energy. From there on out, it’s just changing form.
Anyway, big jets burn about 400 lbs of gas per minute while in cruise. There’s no way the passengers are shedding anywhere near that much weight through heat loss or (pulmonary) respiration. If they were, you’d lose 2,000 fat people by the time the in-flight move was over.
The act of serving dinner has no effect on the weight of the plane. Yes, the passengers convert glucose to CO2 and H2O, and those gasses are vented from the plane. However, they don’t exhale more CO2 and H2O just because they’ve been served dinner. They do it constantly, because if they didn’t they’d be dead. The passengers get a tiny bit lighter every time they breathe. And pressurized fresh air is constantly added to the plane, so the net weight of the air doesn’t change.
Think of it this way. Stand on a scale, holding a sandwich. Look at your weight. Stuff the sandwich in your mouth. Look at your weight. Chew the sandwich. Look at your weight. Swallow the sandwich. Look at your weight. Every reading will be the same. If you had a sensitive enough scale you could detect yourself getting slightly lighter every time you exhaled, because the CO2 and H2O you exhale mass more than the O2 you inhale. Plus you’d see weight loss through insensible persperation as you evaporate water from your skin and mucous membranes. But those tiny changes aren’t affected by the act of chewing and swallowing a sandwich, they go on whether you chew and eat or not. The only time you’d see a change is if you shit or pissed or spit or vomited or expelled any other random bodily fluid off the side of the scale.
If you put someone in a sealed can with some food and put the can on a scale, you’d see no change in mass even from breathing and persperation, because the gasses wouldn’t be able to escape the can. The can would weigh the same as the person ate, drank, exhaled, pissed, shit, sweated, jacked off, suffocated, died, and decomposed.
I’ve heard that it used to be, but is no longer. The waste is stored and sucked from the tank at the airport, to be properly dealt with in a real sewage plant.
The problem was not the danger of occasional ice comets striking people, but more that dumping untreated shit and urine regularly into the air is kind of bad for the enviorment, mkay?, and major airports being near major cities have the equipment for treating shit properly.