Hey B-P why is the sky blue?

[Suesumba]

but when yu up inna di airplane it's not??? [img]/forums/images/graemlins/confused.gif[/img] [img]/forums/images/graemlins/confused.gif[/img]

lying down on divan, spraying the air with sweet perfume, wearing a plain white cotton slip, awaiting the answer with small shallow, panting, breaths
[img]/forums/images/graemlins/70365-flirt.gif[/img] [img]/forums/images/graemlins/70365-flirt.gif[/img]

[Hush Darlin]

Re: Hey B-P why is the sky blue?

mawnin Sue what happin to you mek u dey li dung pan divan wid dem kinna breath dey [img]/forums/images/graemlins/confused.gif[/img]

[JesusDread]

Re: Hey B-P why is the sky blue?

[img]/forums/images/graemlins/704555_dwl.gif[/img]

Shi a wait fi a rent-a-dread but shi goin get JesusDread instead!

Di sky a wha color when yu up ina plane?

[img]/forums/images/graemlins/confused.gif[/img]

[Hush Darlin]

Re: Hey B-P why is the sky blue?

Originally posted by JesusDread:
[qb] [img]/forums/images/graemlins/704555_dwl.gif[/img]

Shi a wait fi a rent-a-dread but shi goin get JesusDread instead!

Di sky a wha color when yu up ina plane?

[img]/forums/images/graemlins/confused.gif[/img] [/qb]

u ha nuff rylicks eeh [img]/forums/images/graemlins/704555_dwl.gif[/img]

[Suesumba]

Re: Hey B-P why is the sky blue?

mi a wait fi B-P lyrics like doh:

B-P
Forward facing, coordinated eyes afford any animal the ability to perceive depth in what is termed stereoscopic vision. Only owls and birds of prey such as eagles, falcons, and kestrels possess stereoscopic vision among the bird species. The remainder of birds such as robins and pidgeons cannot distinguish depth very well and may not perceive a glass pain under certain lighting conditions. The result is unwitting kamikazee flights into building facades.

[img]/forums/images/graemlins/704555_dwl.gif[/img]

[JesusDread]

Re: Hey B-P why is the sky blue?

[img]/forums/images/graemlins/confused.gif[/img] [img]/forums/images/graemlins/confused.gif[/img]

A whe si juss seh????

Translate dat tu patwah pleeze

[img]/forums/images/graemlins/704555_dwl.gif[/img] [img]/forums/images/graemlins/704555_dwl.gif[/img]

[neutral]

Re: Hey B-P why is the sky blue?

Originally posted by JesusDread:
[qb] [img]/forums/images/graemlins/confused.gif[/img] [img]/forums/images/graemlins/confused.gif[/img]

A whe si juss seh????

Translate dat tu patwah pleeze

[img]/forums/images/graemlins/704555_dwl.gif[/img] [img]/forums/images/graemlins/704555_dwl.gif[/img] [/qb]

shi seh robins an pidgins no know hummuch a clack,dem cyaan tell seh glasss deh infront a dem...so dem fly innnah it.

as the saying goes...those who live in glasshouses.......eat bud stew on a regulah basis [img]/forums/images/graemlins/70365-flirt.gif[/img]

[JesusDread]

Re: Hey B-P why is the sky blue?

Tank yu Neutral. Nuttn like a true baan Jomaykan explenashan fi set di rekard strait.

Now mi kno why bud need glasses

[Suesumba]

Re: Hey B-P why is the sky blue?

still a wait pon Boricu-Papa

mmmmmmmm i wondering if he's puttering around in his house genetically engineering a race of six inch high people to do his negarious bidding

[BoundBrook]

Re: Hey B-P why is the sky blue?

SueSumba, you know what I think?

The man who discovered (well actually stole someone else research and then discovered) DNA died yesterday. I think BP is in mourning, or celebration, with the rest of us Science nerds.

[Boricua_papi]

Re: Hey B-P why is the sky blue?

Sorry for the delay. I have been working with a summer student on their project presentation.

The sky is blue because molecules of oxygen and nitrogen, which compose the bulk of the earth's atmosphere, interact with incoming solar radiation in such a way that short wavelength (blue) is preferentially scattered while light at longer wavelengths (green,yellow, orange, and red) passes through the atmosphere unhindered.

The reason that oxygen and nitrogen molecules only scatter blue light is that they possess scattering cross sections which coincide with the wavlengths of blue, violet, and near ultraviolet radiation.

This scattering process is named "Rayleigh Scattering" in honor of 19th century physicist John William Strutt, 3rd Baron Rayleigh, its discoverer.

One final point. If the scattering particles become large enough, then Mie Scattering occurs. Light at all wavelengths is scattered in this process making an object appear white. This is the the type of scattering that makes clouds appear white

[Boricua_papi]

Re: Hey B-P why is the sky blue?

Having just flown back from Grand Forks, North Dakota. I did not observe a sky color other than blue. Perhaps if one were to fly at altitudes above those which are flown by most commercial jumbo jets, ( > 11 km or 35-40k feet), one would begin to notice a darkening of the sky due to the reduced density of air and the diminished strength of Rayleigh scattering. As one were to transition from the troposphere to the stratosphere and mesosphere, the darkening of the sky would become much more pronounced until the view outside the window would be indistinguishable from the view from space.

[Suesumba]

Re: Hey B-P why is the sky blue?

Originally posted by Boricua_papi:
[qb] Sorry for the delay. I have been working with a summer student on their project presentation.

The sky is blue because molecules of oxygen and nitrogen, which compose the bulk of the earth's atmosphere, interact with incoming solar radiation in such a way that short wavelength (blue) is preferentially scattered while light at longer wavelengths (green,yellow, orange, and red) passes through the atmosphere unhindered.

The reason that oxygen and nitrogen molecules only scatter blue light is that they possess scattering cross sections which coincide with the wavlengths of blue, violet, and near ultraviolet radiation.

This scattering process is named "Rayleigh Scattering" in honor of 19th century physicist John William Strutt, 3rd Baron Rayleigh, its discoverer.

One final point. If the scattering particles become large enough, then Mie Scattering occurs. Light at all wavelengths is scattered in this process making an object appear white. This is the the type of scattering that makes clouds appear white [/qb]

[img]/forums/images/graemlins/70365-flirt.gif[/img]

[Suesumba]

Re: Hey B-P why is the sky blue?

you're so cheeky too re deep blue and raliegh scattering [img]/forums/images/graemlins/70365-flirt.gif[/img]
okay, next question:

why is it that when you throw a pebble in a pond it ripples from the centre outward and not vice-versa?

[Boricua_papi]

Re: Hey B-P why is the sky blue?

Originally posted by SueSumba:
[qb] you're so cheeky too re deep blue and raliegh scattering [img]/forums/images/graemlins/70365-flirt.gif[/img]
okay, next question:

why is it that when you throw a pebble in a pond it ripples from the centre outward and not vice-versa? [/qb]

To phrase a well worn cliche "Nature abhors a vacuum." However, one might add that "Nature is lazy and will always find the easy way it."

Throw a pebble in a pond. What happens?

1. The pebble compresses the water underneath it at the point of contact.

2. The compressed water achieves a high density as more molecules are packed into a smaller volume. This excess energy must come into equilibrium with its surroundings.

3. The amount of energy is sufficiently high so means of energy transport such as thermal radiation cannot effectively bring the energy in the water compressed by the pebble into equilibrium with its surroundings.

4. Nature takes the lazy route to achieving equilibrium - bouyancy waves that can efficiently tranport the excess energy away from the point where the pebble made contact with the water.

5. These Circular surface waves develop and propagate away frpom the point where the pebble made contact with the water as the force of gravity attempts to balance bouyancy forces within the pond in order to acieve hydrostatic equilibrium.

Soh Sue. Caan mi get wan feelup aftah all dis? [img]/forums/images/graemlins/wink.gif[/img]