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#1
hi pit

I was wondering if anyone could explain to me why air over hot objects seems to look 'floaty' and distorted is there a name for this?

thx
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#4
(I think) its because its has a higher carbon content? But don't quote me on it.
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#5
Quote by ProphetToJables
(I think) its because its has a higher carbon content? But don't quote me on it.

#6
I believe the scientific terminology is "floaty air".
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#7
I thought the term was heatwave?

Apparently not, I always thought the heatwave was the prolonged period of hot weather as well as the wave above heat.
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#10
Quote by Trowzaa
I thought the term was heatwave?


no, a heat wave is about weather, or a layman's term... it's refraction.
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#11
The technical term is : Pneumonoultramicroscopicsilicovolcanoconiosis.
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#16
Refraction, since light is changing speeds it is bending. Look up mirage.
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#17
I'm sure its just that the ground is hot and then the little heat particles go like "Man, **** this shit!" and then they leave this dimension via lots of small portals that we, humans, see as wavy air.
#18
br00talz air distortion.
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#19
anybody wanna make an aircore band?

we'll use lots of refraction shit
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#20
Quote by Kumanji
That's heat haze. Turbulence when the air heated up by a hot object rises upwards and meets the cooler air around it.


Very good, but turbulence is a result of convection. Not sure if that's what you meant, but if you did, good work!

Heat haze is caused by the refraction of light as it passes through zones of different air temperatures.

Refraction is the bending of light as it passes through two different media with different refractive indexes.

These refractive indexes are a function of temperature.

Now, air near hot objects is heated and mixes with cold air through convection, etc. This gives rise to turbulence - gas currents moving in varying directions at various speeds.

As light passes through these turbulent regions, it is refracted, and due to the changing and unsteady nature of turbulence, it appears to be refracted in an unsteady and turbulent way. This is the phenomena you observe as heat haze.
Last edited by LordBishek at May 25, 2011,
#21
it be demons, mah boi.
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#22
rebellious gravity
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#25
thats just persons bad breath you see



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#26
Quote by LordBishek
Very good, but turbulence is a result of convection. Not sure if that's what you meant, but if you did, good work!

Heat haze is caused by the refraction of light as it passes through zones of different air temperatures.

Refraction is the bending of light as it passes through two different media with different refractive indexes.

These refractive indexes are a function of temperature.

Now, air near hot objects is heated and mixes with cold air through convection, etc. This gives rise to turbulence - gas currents moving in varying directions at various speeds.

As light passes through these turbulent regions, it is refracted, and due to the changing and unsteady nature of turbulence, it appears to be refracted in an unsteady and turbulent way. This is the phenomena you observe as heat haze.


This virgin knows what he is talking about.
#27
Quote by DecaPodge
br00talz air distortion.

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Stay classy, pit.
#28
Quote by Doobergn
This virgin knows what he is talking about.



Like you'd know anything about sex. Your penis has a steering wheel, four wheels and a gas mileage of about 17mpg.

The thing I don't understand is this - you keep whining about being "too cool" to "read whole threads" and taking every opportunity to try to convince me about your awesome life, yet you seem to devote a disproportionate time to try to annoy me.

If you really had an awesome life, why are you sat on the net trying to annoy me? I don't follow your threads and then see your post and think "I'll make fun of him! This will be so cool!" - frankly, I really do have better things to do. If you have such an awesome life - then why don't you?

Now fuck off and stop trying to annoy me. This was funny initially, it was like being chased by a dog with downs syndrome. But the more and more you try to follow me around, the more annoying you are. Stop trying to troll me. I can't make this any clearer - go live your awesome life, fuck off, and leave me alone.
Last edited by LordBishek at May 25, 2011,
#29
Quote by Doobergn
This virgin knows what he is talking about.


...
You're a twat.

Anyway, Bishek wins this thread.
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#31
Hot air is similar to a fluid in the sense that it will have a different specific weight when heated. The rippling is yhe cooler air replacing the the heated air on the surface that is heated.
Grammar and spelling omitted as an exercise for the reader.
#32
Quote by laid-to-waste
anybody wanna make an aircore band?

we'll use lots of refraction shit


I'm so down for this.
#33
Fucking magic, mate.
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#34
Quote by G.Krizzel
I think it has something to do with you not knowing how to use google.

up yours
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#35
Quote by LordBishek
Very good, but turbulence is a result of convection. Not sure if that's what you meant, but if you did, good work!

Heat haze is caused by the refraction of light as it passes through zones of different air temperatures.

Refraction is the bending of light as it passes through two different media with different refractive indexes.

These refractive indexes are a function of temperature.

Now, air near hot objects is heated and mixes with cold air through convection, etc. This gives rise to turbulence - gas currents moving in varying directions at various speeds.

As light passes through these turbulent regions, it is refracted, and due to the changing and unsteady nature of turbulence, it appears to be refracted in an unsteady and turbulent way. This is the phenomena you observe as heat haze.


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#36
It's not air. That's the new Marshall MG. It's got crushing air distortion. It's only $700 for the 50 watt halfstack, but it's all Marshall. Just like an MG.

On topic, I watched it all day yesterday. I started wondering that. Shit gets boring when you're planting beans at 7 mph in a field allllllll day.

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#37
Quote by Dirge Humani
The only thing Ash forgot is the reason hot air and cold air have different refractive indices is that hot air is less dense.


No, I didn't, but good work on catching it - I said proportional to temperature for a reason.

The reason is thus: you are technically right, refractive index is proportional to density.

Density is also proportional to temperature, but this is small compared to the contribution from the pressure and the gas constant

Specifically:

rho = P / (RT)

rho=density
P=Pressure
R=Gas Constant
T= Temperature.

However, the magnitude of density is ~ 1. Whereas the magnitude of the pressure is ~100,000. So the density is inversely proportional to temperature by a ratio of about 300

So changes of a few degrees result in very, very small density changes - in fact, air is assumed to be a generally incompressible fluid up to a Mach number of 0.3 - itself a function of temperature.

BUT

Refractive index is proportional to the wavelength, wavespeed and temperature

n=c*T/lambda

Where

n=refractive index
c=wave speed
lambda=wave length

Now, for visibile length,

c= 3* 10^8
lambda= 400 to about 700 nm = 4*10^-7 to about 7*10^-7

rewrite

n ~ (c/lambda) T

but c/lambda ~ 10^14

Contrast that to the mere 300 for the density/temperature relation, and it's clear that temperature affects refractive MUCH more than density.

Quote by Kivarenn82
Hot air is similar to a fluid in the sense that it will have a different specific weight when heated. The rippling is yhe cooler air replacing the the heated air on the surface that is heated.


Specific weight? Do you mean specific gravity?

Cos weight = m*g and specific means per unit mass, so specific weight is m/m * g = g

Which is gravitational acceleration
Last edited by LordBishek at May 25, 2011,
#38
Quote by LordBishek


Like you'd know anything about sex. Your penis has a steering wheel, four wheels and a gas mileage of about 17mpg.

The thing I don't understand is this - you keep whining about being "too cool" to "read whole threads" and taking every opportunity to try to convince me about your awesome life, yet you seem to devote a disproportionate time to try to annoy me.

If you really had an awesome life, why are you sat on the net trying to annoy me? I don't follow your threads and then see your post and think "I'll make fun of him! This will be so cool!" - frankly, I really do have better things to do. If you have such an awesome life - then why don't you?

Now fuck off and stop trying to annoy me. This was funny initially, it was like being chased by a dog with downs syndrome. But the more and more you try to follow me around, the more annoying you are. Stop trying to troll me. I can't make this any clearer - go live your awesome life, fuck off, and leave me alone.


Ash-1
That other guy- 0
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#39
Quote by LordBishek
No, I didn't, but good work on catching it - I said proportional to temperature for a reason.

The reason is thus: you are technically right, refractive index is proportional to density.

Density is also proportional to temperature, but this is small compared to the contribution from the pressure and the gas constant

Specifically:

mathmathmathmath

I don't get paid to read, man >_< I just skimmed through everything and didn't see temperature or density
#40
Quote by Dirge Humani
I don't get paid to read, man >_< I just skimmed through everything and didn't see temperature or density


Oh Tyler
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