"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.

My lab report is now asking me how changing the concentration of the 2 dye solutions affected the amount of green laser light that was able to pass through and the affect of adding more cuvettes.

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Context: I recently performed a laser pointer absorbance lab in my chemistry class. A green laser pointer was used to observe the light intensity when passing the laser pointer through cuvettes with different solutions. The red dye was used to make a concentrated solution in a cuvette, and a diluted solution in a cuvette; we then turned on the green laser and observed the intensity of the light on a black paper, then we placed the concentrated cuvette in front of the green laser, then the diluted solution, and then both solutions back to back to that the laser would pass through the concentrated and diluted cuvettes. I did the exact same thing for the green dye - concentrated and diluted solution observations, and then both solutions together.

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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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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.

My Question: Is there a reason why my green dye solutions did not change the light intensity, shouldn't have my green dye concentrated solution not have let much light pass through like my red concentrated one did (this doesn't make sense to me because both concentrated solutions have more molecules to absorb light and should not have much light pass through). If someone could just help me understand my observations better and why I had this outcome that would be extremely helpful!

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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).

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.

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