r4m0n changed the topic of #kspmodders to: Technical discussion ONLY (KSP related or not), for random shit-talking, join #shitshow (seriously)
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<G-Mobile>
If you have a sufficiently powerful laser, can it "burn" away clouds
<Truga>
not really a laser if it's that wide, is it
<Truga>
:D
<G-Mobile>
It can scan
<Truga>
but why not just get a big light instead and save on the giant tilt motors
<G-Mobile>
Either it'll scan, or it'll work like a laser projector
<G-Mobile>
Because I want to PRINT ADS ON THE SKY
<Greys>
imagine you walk out side, and very clearly on the bottom of a cloud, is the Intel logo
<Truga>
oh well
<Truga>
i'm sorry for your loss
<Greys>
presumibly if you heat the water vapor it would cease to be visible for a time, so you'd need a wavelength of light the cloud will absorb very locally
<Greys>
then you need a laser powerful enough to still boil cloud fluff at the range in question; almost certainly lower level clouds because they're more likely to have wide flat bottoms; and being closer helps a lot
<Greys>
a microwave laser would probably be the right choice
<SilverFox>
but clouds are rarely still
<SilverFox>
like, they eb and flow inside themselves
<Greys>
sure, it's not going to stay put, and it's going to warp over time
<SilverFox>
especially the other edges
<SilverFox>
if you make a hole, it'll get filled in
<Greys>
so you'd need to "print" the image rapidly, and be willing to abandon it
<Greys>
if things work well you could track the cloud for the time it's within range, reinforcing the image
<SilverFox>
what's more practical is to make a cloud in the shape of what you want
<Greys>
to be clear I don't want to put a hole through the cloud, I want to engrave it into the cloud, but that is still a hole
<Truga>
what's more practical is to just project light instead of shaping the cloud :p
<Truga>
light bounces off cloud -> profit
<Greys>
microwave lasers are light
<Truga>
clouds are white so it's a perfect plan
<Greys>
maybe we can use a daylight spotlight to project light into the engraving; that'll make it stick out better, and help to reduce refill
<SilverFox>
or you can just make a cloud like people have been doing, because it works
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<Greys>
nah, it has to be an organic non-GMO cloud
<SilverFox>
also good luck powering your laser, water takes quite a bit of energy to boil
<Greys>
water yes, but water vapor that's already next to the boundary layer, less so
<Truga>
no
<Greys>
the bottoms of clouds you should know are not the definitive bottom of where there's water vapor, just where the pressures and temperatures align with humidity to permit visible water vapor to condense
<SilverFox>
it's not like it's at the brink, you still need a lot of power
<SilverFox>
and because you're putting that energy into the water, you're adding energy to whole climate circulation
<Greys>
did you know that there are people trying to use lasers to form clouds?
<Truga>
isn't like 50% of the power required to get water to 101 degrees from room temp getting it from 99 to 101?
<Truga>
or even more?
<SilverFox>
idk
<SilverFox>
but water never reaches anywhere near boiling when evaporating
<Greys>
I can't even parse that
<SilverFox>
pressures and shit and wind allow it to pick up layer after layer of water particles
<Truga>
yeah
<SilverFox>
however, this is still a considerable energy dump into the system and that's Bad(tm)
<Greys>
these scientists are shooting moist air with lasers to make it warm enough at that altitude to form the seed of a cloud; which other water vapor can then nucleate on
<Greys>
so, lasing clouds may just not do the printer burning at all
<Greys>
maybe it'll be like the foam gun in prey?
<Truga>
basically
<Truga>
you need 335kJ to heat up water to its boiling point from room temp
<Truga>
and then another 2600 to vaporise it
<Truga>
:P
<Truga>
2600kJ that is
<Truga>
this is for 1kg
<Greys>
you're treating this as if I'm shooting a laser into a lake
<Greys>
this is already vaporized water
<Truga>
well, you are
<Truga>
no
<Greys>
yes
<Truga>
clouds are specifically ice or droplets
<Truga>
not vapour
<Truga>
you can't see water vapour, it's invisible
<Greys>
you can't see steam, clouds are water vapour
<Truga>
.....
<Truga>
yes, exactly
<Truga>
steam *is* vapour
<Greys>
the white stuff out of a kettle is steam that has cooled and condensed into vapor and is now visible
<Truga>
no
<Truga>
no that's wrong
<Truga>
that's not how any of that works
<Greys>
steam is gaseus water, vapour is atomized liquid