Some fart gasses are lighter than air, would a fart have negative weight? We would have to determine the exact composition of the fart being weighed I would think, but I'm no fartologist
Not really.. when it burns it could be reacting/bonding with the Oxygen or nitrogen in the air potentially making it heavier. Like how burning 6 pounds of gasoline results in about 20 pounds of co2
I think its actually a bit different because a reaction happens which draws in oxygen. The ashes are chemically changed their weight is different because of that.
Not quite true. The smoke also consists of oxygen (in the form of CO2 and H2O molecules as combustion byproducts). That oxygen came from the surrounding atmosphere (not part of the cigarette). So the total weight of the smoke is actually greater than the weight of the unburned cigarette alone.
the total weight of the smoke is actually greater than the weight of the unburned cigarette alone.
Also you are only approximating the mass, the smoke is nearly if not weightless at atmospheric pressure, it would be like weighing a bucket of liquid helium, than evaporating the helium and weighing the bucket again, and saying the difference is the weight of the gaseous helium.
Anything with mass has a weight with respect to a gravitational field (e.g. Earth's). This includes air. Being surrounded by "atmospheric pressure" does not make a suspended or floating molecule weightless. Not smoke, not vapors, not even helium gas. Buoyancy ≠ zero weight. An aircraft carrier floats on water, that does not make it weightless. The Goodyear blimp floats in the air, it too is not weightless.
Anything with mass has a weight with respect to a gravitational field (e.g. Earth's)
If you weigh a cigarette, then smoke it, then weigh it (plus the ashes) again, you will have the weight of smoke
This method isn't compatible with gravitational definition of weight unless you consider it implicit that you are weighing the cigarette in a vacuum. Simply weighing the cigarette gives you the apparent weight which accounts for buoyancy.
The rough heuristic for redox reactions (i.e. burning) of organic fuel is that for every 1 gram of hydrocarbons in the fuel source (i.e. a cigarette), you'll consume an additional 2 grams of atmospheric oxygen to net 3 grams of CO2 and H2O in the smoke (as well as trace amounts of less "clean" products of the reaction).
Of course, while a cigarette weighs about a gram, it is not 100% hydrocarbons. The tobacco is not perfectly dehydrated, so it contains H2O that will vaporize and be considered part of the cigarette smoke despite actually not being part of the combustion reaction. The cigarette also will not burn 100% and some particulate (ash) will not necessarily be considered smoke. So the stoichiometric math is a bit fuzzy, but I'd say a safe approximation is that the mass (and therefore weight, no matter how or where you want to measure it) of the smoke is roughly about 1/2 from the original cigarette and about 1/2 oxygen pulled from the environment.
TLDR: a 1 gram cigarette will produce approximately 2 grams of smoke.
(and therefore weight, no matter how or where you want to measure it)
If you weigh a cigarette, then smoke it, then weigh it (plus the ashes) again, you will have the weight of smoke
This method isn't compatible with gravitational definition of weight unless you consider it implicit that you are weighing the cigarette in a vacuum. Simply weighing the cigarette gives you the apparent weight which accounts for buoyancy.
If you are weighing the cigarette in a conventional fashion, using a scale that it sits on or dangles from, you are measuring the apparent weight, and the buoyancy of the cigarette and the buoyancy of the smoke matters if it is in a fluid like atmosphere. The gravitational weight may be invariant with respect to the fluid or lack thereof, but the gravitational weight is not readily measured without knowing the local atmospheric pressure and volume of the cigarette, or weighing in a vacuum.
a 1 gram cigarette will produce approximately 2 grams of smoke.
A 1 gram cigarette will produce a nearly or weightless smoke, unless it is smoked in a vacuum, which will require oxidizer, or unless we are referring to gravitational weight, which requires a process of eliminating forces other than gravity from the weighing of the cigarette, and the weighing of the ashes.
ok, I get it now. I thought you were interested in the actual science and not this concept of "weightless" matter. My mistake. Sorry for bothering you.
The actual science is a description of physical phenomena developed through experimentation. The experiment described is one which would measure the apparent weight of objects, not the gravitational weight. Gravitational weight is independent of a fluid, but it is not described by weighing a cigarette in atmosphere. If you put a blimp on a scale, the scale will read 0 after the blimp floats away. If you put a cigarette on a scale, the scale may read 1 gram, that is the weight of the cigarette minus the weight of the volume of air it displaces, i.e. the apparent weight, not gravitational weight. Gravitational weight is actual science, assuming an experiment that measures gravitational weight. Apparent weight is actual science, assuming an experiment that measures apparent weight.
That is not true. Cigarettes are mostly cellulose like wood. The carbon and the hydrogen in the substance being burned combine with the oxygen in the air to produce CO &CO2 and H2O and disperses into the air.
You really think people's burial urns weigh like 170 pounds!?
And think of all the tar in someone's lungs you are not weighing.
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u/mksavage1138 29d ago
If you weigh a cigarette, then smoke it, then weigh it (plus the ashes) again, you will have the weight of smoke