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Carbon dioxide (chemical formula CO2) is a colorless gas with a density about 50% higher than that of dry air. Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas at a concentration of about 0.04 percent (400 ppm) by volume. Natural sources include volcanoes, hot springs and geysers, and it is freed from carbonate rocks by dissolution in water and acids. Because carbon dioxide is soluble in water, it occurs naturally in groundwater, rivers and lakes, ice caps, glaciers and seawater. It is present in deposits of petroleum and natural gas. Carbon dioxide is odorless at normally encountered concentrations, however at high concentrations it has a sharp and acidic odor.
As the source of available carbon in the carbon cycle, atmospheric carbon dioxide is the primary carbon source for life on Earth and its concentration in Earth's pre-industrial atmosphere since late in the Precambrian has been regulated by photosynthetic organisms and geological phenomena. Plants, algae and cyanobacteria use light energy to photosynthesize carbohydrate from carbon dioxide and water, with oxygen produced as a waste product.
Carbon dioxide (CO2) is produced by all aerobic organisms when they metabolize carbohydrates and lipids to produce energy by respiration. It is returned to water via the gills of fish and to the air via the lungs of air-breathing land animals, including humans. Carbon dioxide is produced during the processes of decay of organic materials and the fermentation of sugars in bread, beer and wine making. It is produced by combustion of wood and other organic materials and fossil fuels such as coal, peat, petroleum and natural gas. On the other hand, it is an unwanted byproduct in many large scale oxidation processes, for example the production of acrylic acid (over 5 million tons/year).
It is a versatile industrial material, used, for example, as an inert gas in welding and fire extinguishers, as a pressurizing gas in air guns and oil recovery, as a chemical feedstock and as a supercritical fluid solvent in decaffeination of coffee and supercritical drying. It is added to drinking water and carbonated beverages including beer and sparkling wine to add effervescence. The frozen solid form of CO2, known as dry ice is used as a refrigerant and as an abrasive in dry-ice blasting.
Carbon dioxide is the most significant long-lived greenhouse gas in Earth's atmosphere. Since the Industrial Revolution anthropogenic emissions – primarily from use of fossil fuels and deforestation – have rapidly increased its concentration in the atmosphere, leading to global warming. The CO2 released into the atmosphere as a result of the use of fossil fuels "represents [sic] 99.4% of CO2 emissions in 2013". Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid.
Brand New, never fired, Smith & Wesson M29 co2 pistol.
Clint Eastwood's "most powerful handgun". I won this in an airgun photo contest, but I'll never use it. I'm more a rifle guy. :)
PRICE: $100 cash, porch...
I have more air pistols than I'll ever use. If that's possible. :)
I have to offer a very fine near mint Umarex SA-10 pellet repeater.
Price: Yours for only $50. Purchased May of 2021, maybe 200 rounds through it.
If ya have time, you're welcome to try it out first in my...
Walther CP88 6" Competition with case and accessories. $150 (price online $222-$290)
30 Crosman co2 cartridges. $25 ($5.69/5 at BiMart)
1000 Crosman pellets. $15 ($4.79/250 at BiMart)
$165 for all
For sale, airsoft Glock 19 gas blowback pistol
I used this for practice indoors, but no longer carry a Glock so I'm getting rid of this.
Realistic blowback (I would say feels like a .22)
Disassembles like a real Glock
Last round slide lock
Similar trigger feel/reset to a real Glock...
I picked this up a couple months ago from a forum member with another airgun so I don't know the actual age or round count.
I have shot a couple mags through it since I got it, but it looks to be very near like new condition.
I picked up some other toys this weekend, so I am listing a few...
Daisy 5501 Powerline CO2 BB pistol
Metal frame, blow-back, 15-round mag, 400+FPS, slide-lock, safety, hammer-release, and more.
Includes co2, bbs and targets. Everything one needs to get started.
Makes for great "dry-fire" exercises or as a "blue-gun" for training. I have two, so the spare...
Bought only 2 weeks ago, perfect condition with a bunch of extras. Ar15 style bb gun shoots around 430FPS semi auto or full automatic 25 rounds a second, 1400 rounds a minute. has laser sight mounted as well as flip up iron sights, and a sling, 1 extra 25 round mag(2 magazines total), pellgun...
Walther Talon Magnum .22 (aka Hatsan 125) Air Rifle
PRICE: $200 (still retails for 300, if you can find 'em)
Includes ammo and targets. Everything you need to shoot. :s0019:
(no scope, no bipod, no lasers, no hot babe to carry it home for ya, sorry.)
Zero issues. You're welcomed to try...
Beeman QB78S (sport, synthetic) .177 co2 Air Rifle
$100 as you see it. Some minor mods, mostly looks. Purchased new January 2020.
Works flawlessly, and you're welcome to try it out before buying.
Trades? Other air-guns perhaps. What I might make here is just going to another one...
Umarex Glock 19 Gen. 3 CO2 BB Air Pistol
(click to enlarge)
Yours will be as pictured, new in packaging.
Fixed, Glock-style sights
Official Glock license and markings
Features Glock's distinctive DA trigger
Compact version of the standard size Glock 17
16rd BB capacity...
Hello I have a in like new condition with box and manual 177 cal co2 pistol not sure if there would be any interest if so I can send pics and exact model # it's blued not sure on price either so I will say 150.00 and if I'm crazy let me know please be honest thanks have a great day
If the front falls off of your Umarex CP88 it's not the end of the world. :eek:
The tiny 2mm x .5mm thread screw, in the spring guide, under the barrel has stripped out. :mad:
You can replace it by drilling and tapping the hole in the spring guide out to 6x32, 1/4"
deeper and using a 6x32"...
Up for sale is an alfa proj CO2 10m air rifle. Comes with two bulk fill CO2 containers, tools to change the CO2 as well as additional inserts for the front sight among other accessories. The barrel has been coated in black (not sure the coating but looks good), the rifle has some wear on it but...
Western Justice Licensed John Wayne Colt Single Action BB Revolver
Near mint condition, flawless performance, zero issues. Barely a year old.
PRICE: PRICE: $NEW LOWER PRICE, SEE LATEST POST.
About 1/3rd the retail price ($150, plus extras)!
Local pickup, no shipping. You're welcome to try...
Picked up a nice example of the blued version at a garage sale today, it's NOS, mint condition, as new in box. Still has the "Sportwest" price tag on it from 1970 and a 4 pack of Co2 tube in the box.
Anyone know of a collector?
Sig Sauer MCX .177 CAL Co2 Powered (30 Rounds) Air Rifle with Red Dot
18 inch rifled steel barrel
Metal housing, Synthetic stock
Weaver/Picatinny optics rail
Uses an 88 or 90 gram CO2 cartridge
30 round Roto-Belt pellet magazine
Semi-auto, 700 FPS, weighs about 8lbs
Adjustable flip-up front...