People might say that is is because air has no source to absorb the paint but even air has molecules so then, why is it that we can't paint in the air?


closed as off-topic by Separatrix, L.Dutch, F1Krazy, Mołot, dot_Sp0T Apr 18 '18 at 9:13

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  • $\begingroup$ Because in order to paint you would need to use paint and air is not a good medium to deposit said paint! $\endgroup$ – Cbm.cbm Apr 18 '18 at 8:32
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    $\begingroup$ You absolutely can. see e.g. en.wikipedia.org/wiki/Skywriting . You can also have a dye molecule in a matrix of nitrogen molecules which technically would also be "painting in the air". $\endgroup$ – Raditz_35 Apr 18 '18 at 8:36
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    $\begingroup$ We can paint in the air. The problem is that air is a fluid, and molecules in a fluid move around a lot, thus dispersing the pigment and effacing the image. $\endgroup$ – AlexP Apr 18 '18 at 8:46
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    $\begingroup$ Welcome to worldbuilding. As the name might suggest, here we like worldbuilding questions. Your looks hardly as such. Can you rework it? $\endgroup$ – L.Dutch Apr 18 '18 at 8:56

With science and tech we have today, and probably in the future as well, it can't be done (In a way that resembles other types of painting, like the example you give in your question).
The main reason is that air is gas, and to paint it, you would need gas as well. The way gas behaves is expanding to fill what ever container it is in. (Not exactly expand, a more accurate description would be to say that gas particles tend to move apart from one another).
This causes a problem, because if We were to release a "gas-paint" it would quickly spread away.
If we would take a closed space (e.g. a glass box) and fill it with said "gas-paint" it won't spread, but would be either heavier or lighter then the air in the box, causing it to either collect on the bottom or top (respectively) of the box.

  • $\begingroup$ Are you suggesting that "gas particles" do not move anymore (except for up and down) if you put them into a "closed glass box"? $\endgroup$ – Raditz_35 Apr 18 '18 at 8:43
  • $\begingroup$ Of course not. They still move, but within confined borders. What I tried to express is that even if you try work-arounds, the concept still won't work. The box part was a non-general way of saying "even if you overcome gas-paint dispersing". $\endgroup$ – Rick M. Apr 18 '18 at 8:46
  • $\begingroup$ When you say gas-paint collects at either the top or bottom of the closed glass box doesn't that mean that the bottom or the top of the box would be colored?worldbuilding.stackexchange.com/users/37861/raditz-35 $\endgroup$ – Arya Shrestha Apr 18 '18 at 8:49
  • $\begingroup$ @AryaShrestha This would be an overcomplicated approach. There wouldn't be a clear cut line either, they would still mix quite heavily. You might experience a small color density gradient. Just use a colored gas in a box (of a shape you like) then. Get enough of such glass boxes in various shapes filled with various colored gases and you can create a great painting. $\endgroup$ – Raditz_35 Apr 18 '18 at 8:54
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    $\begingroup$ @AryaShrestha To tag another user in your comment, just type @ followed by their name, as I did. It even autocompletes for you. $\endgroup$ – F1Krazy Apr 18 '18 at 9:11

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