Argon makes a distinctive blue-green gas laser. Argon is also used in incandescent, fluorescent lighting, and other gas-discharge tubes. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. Its triple point temperature of 83.8058 K is a defining fixed point in the International Temperature Scale of 1990.ДЄrgon is extracted industrially by the fractional distillation of liquid air. The complete octet (eight electrons) in the outer atomic shell makes argon stable and resistant to bonding with other elements. The name 'argon' is derived from the Greek word бјЂПЃОіПЊОЅ, neuter singular form of бјЂПЃОіПЊП‚ meaning 'lazy' or 'inactive', as a reference to the fact that the element undergoes almost no chemical reactions. In the universe, argon-36 is by far the most common argon isotope, as it is the most easily produced by stellar nucleosynthesis in supernovas. Nearly all of the argon in the Earth's atmosphere is radiogenic argon-40, derived from the decay of potassium-40 in the Earth's crust. Argon is the most abundant noble gas in Earth's crust, comprising 0.00015% of the crust. It is more than twice as abundant as water vapor (which averages about 4000 ppmv, but varies greatly), 23 times as abundant as carbon dioxide (400 ppmv), and more than 500 times as abundant as neon (18 ppmv). Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv). It is in group 18 of the periodic table and is a noble gas. Adam Baldwin voices the Rebel attempting to prove the AR3 does not exist.Argon is a chemical element with the symbol Ar and atomic numberВ 18.The lines at the end also hint to the player that nothing else will be said and that they, too, should leave and go to the next room to continue the story. Rebel: I'm not going to continue until you leave.ДЄpart from its humor, this scene is also intended to indicate to players who had not yet discovered that the AR2's secondary fire is effective against Hunters.You don't have to be here and I'm not going to continue the lesson until you leave. Refugee: Out in the field? I'm not going out in the field! I'm a radio operator!.Rebel: So, when you're out in the field, you're going to be punching Hunters?.I used to kill ten-twenty a day, just using my fists. We would just wrestle Hunters to the ground with our bare hands. Refugee: We sure as hell didn't use guns.Rebel: No it wa- So, do you know what the alternative fire method does on the AR2? It kills Hunters.Refugee: Well, see, in the city.the place was lousy with AR3s.Rebel: There is no such thing as an AR3.Rebel: So have you ever used an AR2 before?.Their fates are unknown, but it can be assumed that both the Rebel and the radio operator survived the attack, with the latter's survival due to the fact that he didn't go out in the field. The Rebel refuses to resume the AR2 explanations unless the radio operator leaves, which he does not. The other Rebel dismisses his stories as made up, and gets upset when the radio operator says he won't go out to the field because of his position. He claimed he was killing 10 to 20 a day back then. He (and other 'city folks') defeated Hunters with their bare hands.While he has never used an AR2, he did use an AR3 back in City 17, which was 'lousy' with them.Before the meeting, they come across some Rebels and a refugee (the radio operator), who were sitting around another standing Rebel, who was explaining how the Combine AR2 works and how it can be useful against Hunters.Д®arly into the lecture, the radio operator, clearly inexperienced in combat but not willing to show it (and probably wanting to impress the girl next to him, since he keeps looking at her while talking) interrupts the explanation to claim that: When Gordon, Alyx, and Dog get into White Forest, they are greeted by MIRT, and must then meet with Eli Vance and Isaac Kleiner.

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