What is compressedairused for

Usually, near-infrared (NIR) rays are referred to the electromagnetic waves with wavelength ranges from 0.76 μm to 1 μm, short-wavelength infrared (SWIR) from 1 ...

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I keep seeing posts where people recommend using "compressed air" to clean computers and I've been wanting to point something out but the discussions get closed quickly (for rule 13, not because of the discussion of canned air).

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CompressedAircan for PC

Sidelined from serving in World War II by an early bout with tuberculosis, Norman Edmund got the idea to start selling optical parts that he acquired as war ...

Planning on building a computer but need some advice? This is the place to ask! /r/buildapc is a community-driven subreddit dedicated to custom PC assembly. Anyone is welcome to seek the input of our helpful community as they piece together their desktop.

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6 days ago — To meter for your shadows, which is what I recommend for film shooters, take your light meter and face it away from your light. Your light meter ...

Compressedairfor cleaning PC

202059 — The primary magnifier is Donogan optivisors. I've got two heads pieces and probably four or five different lenses. You do want to get the glass lenses.

Edit: some people are criticizing because they already knew this. If you already know this, that's fine, move on. Some people don't.

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Anyway, I just wanted to point out that if you care about what you are releasing into the air, you may have been mislead by the way these are named. Indeed, the propellant used in them is considerably less damaging to the atmosphere than propellants commonly in use 50 years ago, but it is still not without harm, so it's worth knowing about.

Polarized Phoropter TestThis card attaches to your phoroter card to test binocular abilities. When used with the polarized lenses in your phoropter, ...

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pocket microscopes that have sharp resolving power throughout their field of view, yet are designed to give a bright image.

The propellant is a chemical that is not particularly dangerous to humans (if used correctly). When in the can it is in liquid form, and when let out of the can the decompression makes it a gas. The escaping of gas via the nozzle sets up an air current that draws in surrounding air, and thus most of the gas hitting your electronic components will literally just be air, encouraged by that initial movement of the propellant gas as it escaped the nozzle. It's a similar physical principle to the way those dyson fans work.

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"Compressed air" is a marketing term for these products. If they literally did contain only air that is under pressure, they would probably last only one or two squirts. What they actually contain is a propellant substance - just like similar cans that contain deodorant, paint, etc. Except that these "canned air" products don't contain any paint or deodorant, only the propellant.

Normal Distribution X∼N(μ,σ) ; μ= σ= ; x=.