When moth is smoked it goes from a solid, to a liquid, and then goes to a vapor, but when it condenses it seems to go straight to a solid. Why is
that?Sulaiman - 16-7-2019 at 21:01
When moth is smoked it goes from a solid, to a liquid, and then goes to a vapor, but when it condenses it seems to go straight to a solid. Why is
that?
Please do not smoke moths, the scales make you cough.
I've had a play with the most famous subliming substance - iodine.
When heated gently iodine melts then vapourises,
on contact with a cold surface the vapour appears to instantly solidify.
I suspect that it actually rapidly goes via a liquid phase before crystalising,
with the miniscule quantity of heat being dispersed very rapidly.
If there were not a transient liquid phase I'd expect a more homogenous layer of 'dust', not shiny crystals.
I await condemnation Yttrium2 - 16-7-2019 at 21:03
What happens when you hit it with a blow torch?
You lost me with the condemnation thingySulaiman - 16-7-2019 at 21:35
Condemnation for herecy ... I'm saying that iodine does not sublime at atmospheric pressure
If you heat rapidly (e.g. with a gas torch) then the iodine appears to sublime,
the liquefaction to evaporation phase would be so transient that it would appear instantaneous.
... I guess.fusso - 16-7-2019 at 22:09
Condemnation for herecy ... I'm saying that iodine does not sublime at atmospheric pressure
Iodine can still sublime at atmospheric pressure and temperatures below its melting point, just as water can evaporate at atmospheric pressure and
temperatures below its boiling point.Yttrium2 - 17-7-2019 at 02:06
What again causes water to evaporate below it's boiling point?
I've never seen iodine heated with a blow torch. My guess would be there would be a lot of purple clouds! Pyro_cat - 30-7-2019 at 19:13
What again causes water to evaporate below it's boiling point?
the water molecules have different energies, the avarage is the temperature you can measure, this means that there could be molecules with a kinetic
energy equivalent of one at 100°C, so it evaporates if it is on the water-air boundry. water molecules can gain-loose energy by inelastic collisions
with each other.SWIM - 31-7-2019 at 19:34
There may be some destructive distillation going on there as well.
If the condensate has a significant percentage of decomposition products and polymerized gunk it may set up quickly.
