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Author Topic: If water is blue, why is snow white?  (Read 11453 times)

Offline DoctorBeaver

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If water is blue, why is snow white?
« on: 01/03/2009 00:12:24 »
Well? Why? Oh, and frost. That's white too.


 

Offline HaroldH

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If water is blue, why is snow white?
« Reply #1 on: 01/03/2009 01:42:59 »
Water isn't blue.  It is clear.  Oceans etc appear blue because of the way that light is refracted in them.

Ice is white because the crystals reflect all visible light that hits them.

Generally the apparent color of a substance is determined by the way it reflects light.  Since the organization of the molecules is different when crystallized as in ice to free as in water, the light is reflected differently.
 

Offline lightarrow

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If water is blue, why is snow white?
« Reply #2 on: 01/03/2009 02:57:54 »
Well? Why? Oh, and frost. That's white too.
Water is blue because light is transmitted inside, some of the red components are absorbed and part of this light is diffused back (and filtered again); snow and frost are white because light is reflected off, so it isn't filtered out enough (in the process of reflections, only a small layer of molecules give a contribute).
 

Offline Chemistry4me

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If water is blue, why is snow white?
« Reply #3 on: 01/03/2009 04:49:23 »
The water coming out of my taps isn't blue!
 

Offline lightarrow

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If water is blue, why is snow white?
« Reply #4 on: 01/03/2009 10:23:05 »
The water coming out of my taps isn't blue!
Weird. You don't usually put copper sulfate in it?   :)
That tickness is not big enough for the effect to be visible (the absorption coefficient is low, and that's a lucky, or it could be problematic to make spectrometer determination of chemicals in water solution, in analytical chemistry).
« Last Edit: 01/03/2009 10:27:05 by lightarrow »
 

Offline DoctorBeaver

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If water is blue, why is snow white?
« Reply #5 on: 01/03/2009 12:15:00 »
Water is blue. We've had that discussion here before.

From Wikipedia

It is a common misconception that in large bodies, such as the oceans, the water's color is blue due to the reflections from the sky on its surface. This is not true, but was believed to be so decades ago. The main reason the ocean is blue is that water itself is a blue-colored chemical. Optical scattering from water molecules provides a second source of the blue color, but colored light caused by scattering only becomes significant with extremely pure water.

So now answer my question!  :P
 

ScientificBoysClub

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If water is blue, why is snow white?
« Reply #6 on: 01/03/2009 12:28:39 »
Well Water is transparent ... and Light is happy to pass through it ...

where as ice is not transparent ... cos ice crystal shaped like this  *********   will not allow light to pass through it ... and those Crystals r not transparent when they combine with each other ...

 

Offline DoctorBeaver

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If water is blue, why is snow white?
« Reply #7 on: 01/03/2009 12:48:34 »
Ah, that could be the answer. Thank you.
 

Offline dentstudent

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If water is blue, why is snow white?
« Reply #8 on: 02/03/2009 07:52:59 »
    
If water is blue, why is snow white?

Because the seven dwarves.
 

Offline Chemistry4me

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If water is blue, why is snow white?
« Reply #9 on: 02/03/2009 08:17:10 »
Ayyyee? ???
Why is Snow White? Because the seven dwarves??? ???
How does that work...........?
 

Offline Don_1

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If water is blue, why is snow white?
« Reply #10 on: 02/03/2009 08:30:50 »
Ayyyee? ???
Why is Snow White? Because the seven dwarves??? ???
How does that work...........?

It doesn't. The dwarves are on strike.
 

Offline chris

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If water is blue, why is snow white?
« Reply #11 on: 02/03/2009 08:39:42 »
Snow, and clouds, are white despite the inherent blue colour of water because these are both composed of many tiny ice crystals. The crystals are highly reflective and return to your eye the full spectrum of incident light wavelengths. Hence you see white. It's the same reason why water is blue but the spray coming from a wave-tip is white. The irregular water surface reflects all wavelengths.

Water is blue because, in the liquid state, the hydrogen bonds stiffen the molecules making them absorb energy at red wavelengths. Un-hydrogen-bonded water ie free molecules absorb in the infrared, which is why water is an excellent greenhouse gas.

Chris
 

ScientificBoysClub

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If water is blue, why is snow white?
« Reply #12 on: 02/03/2009 09:32:54 »
   
If water is blue, why is snow white?

Because the seven dwarves.

i know snow is white due to ice  crystal shaped like this  *********   will not allow light to pass through it ... when light can't pass through it it gets reflected by ice crystals .. so, it looks like white cos ccrystals in it r white !! GOT IT !!

WHo told u that water is Blue ?

water is transparent !! Well Water is transparent ... and Light is happy to pass through it ...

where as ice cube is not transparent ... due to above reason I told u !! GOT IT
 

ScientificBoysClub

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If water is blue, why is snow white?
« Reply #13 on: 02/03/2009 09:35:45 »
Snow, and clouds, are white despite the inherent blue colour of water because these are both composed of many tiny ice crystals. The crystals are highly reflective and return to your eye the full spectrum of incident light wavelengths. Hence you see white. It's the same reason why water is blue but the spray coming from a wave-tip is white. The irregular water surface reflects all wavelengths.

Water is blue because, in the liquid state, the hydrogen bonds stiffen the molecules making them absorb energy at red wavelengths. Un-hydrogen-bonded water ie free molecules absorb in the infrared, which is why water is an excellent greenhouse gas.

Chris
hi Chris ,
water is transparent  not blue , in oceans we see it in blue cos of reflection and refraction between sky and water.
« Last Edit: 02/03/2009 09:39:00 by ScientificBoysClub »
 

Offline Chemistry4me

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If water is blue, why is snow white?
« Reply #14 on: 02/03/2009 09:36:32 »
Yes, he get's it!
DoctorBeaver is a smart chap :)
Like yourself perhaps ScientificBoysClub?
 

Offline DoctorBeaver

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If water is blue, why is snow white?
« Reply #15 on: 02/03/2009 09:36:48 »
SBC - Just because something is transparent doesn't mean it has to be colourless. Similarly, being coloured does not mean the substance must be opaque. Consider stained glass.

Chris - Thank you. Nicely explained.
 

Offline Chemistry4me

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If water is blue, why is snow white?
« Reply #16 on: 02/03/2009 09:38:03 »
Snow, and clouds, are white despite the inherent blue colour of water because these are both composed of many tiny ice crystals. The crystals are highly reflective and return to your eye the full spectrum of incident light wavelengths. Hence you see white. It's the same reason why water is blue but the spray coming from a wave-tip is white. The irregular water surface reflects all wavelengths.

Water is blue because, in the liquid state, the hydrogen bonds stiffen the molecules making them absorb energy at red wavelengths. Un-hydrogen-bonded water ie free molecules absorb in the infrared, which is why water is an excellent greenhouse gas.

Chris
hey Chris ,
water is transparent  not blue , in oceans we see it in blue cos of reflection and refraction between sky and water.
Do you know who Chris Smith is??? ???
You don't just say to Chris, 'Hey Chris, guess what, you're wrong'!!! GOT IT!!! :D:D
 

ScientificBoysClub

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If water is blue, why is snow white?
« Reply #17 on: 02/03/2009 09:41:45 »
SBC - Just because something is transparent doesn't mean it has to be colourless. Similarly, being coloured does not mean the substance must be opaque. Consider stained glass.

Chris - Thank you. Nicely explained.

hi there

when two transparent medium combined to each other forms a spectrum  ... GOT IT lol
 

Offline Chemistry4me

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If water is blue, why is snow white?
« Reply #18 on: 02/03/2009 09:44:27 »
Snow, and clouds, are white despite the inherent blue colour of water because these are both composed of many tiny ice crystals. The crystals are highly reflective and return to your eye the full spectrum of incident light wavelengths. Hence you see white. It's the same reason why water is blue but the spray coming from a wave-tip is white. The irregular water surface reflects all wavelengths.

Water is blue because, in the liquid state, the hydrogen bonds stiffen the molecules making them absorb energy at red wavelengths. Un-hydrogen-bonded water ie free molecules absorb in the infrared, which is why water is an excellent greenhouse gas.

Chris
hey Chris ,
water is transparent  not blue , in oceans we see it in blue cos of reflection and refraction between sky and water.
Do you know who Chris Smith is??? ???
You don't just say to Chris, 'Hey Chris, guess what, you're wrong'!!! GOT IT!!! :D:D

ok ok  he is also a human like us I give respect to every one !!
Who are you calling human?! :D
 

ScientificBoysClub

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If water is blue, why is snow white?
« Reply #19 on: 02/03/2009 09:45:44 »
Snow, and clouds, are white despite the inherent blue colour of water because these are both composed of many tiny ice crystals. The crystals are highly reflective and return to your eye the full spectrum of incident light wavelengths. Hence you see white. It's the same reason why water is blue but the spray coming from a wave-tip is white. The irregular water surface reflects all wavelengths.

Water is blue because, in the liquid state, the hydrogen bonds stiffen the molecules making them absorb energy at red wavelengths. Un-hydrogen-bonded water ie free molecules absorb in the infrared, which is why water is an excellent greenhouse gas.

Chris
hey Chris ,
water is transparent  not blue , in oceans we see it in blue cos of reflection and refraction between sky and water.
Do you know who Chris Smith is??? ???
You don't just say to Chris, 'Hey Chris, guess what, you're wrong'!!! GOT IT!!! :D:D

ok ok  he is also a human like us I give respect to every one !!
Who are you calling human?! :D
why do u diverting the topic ?... oh common everyone is human  ........
 

ScientificBoysClub

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If water is blue, why is snow white?
« Reply #20 on: 02/03/2009 09:47:26 »
Yes, he get's it!
DoctorBeaver is a smart chap :)
Like yourself perhaps ScientificBoysClub?
I am just a student ... i am not that smart and soon I will be ...
 

Offline Chemistry4me

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If water is blue, why is snow white?
« Reply #21 on: 02/03/2009 09:48:05 »
Yes, he get's it!
DoctorBeaver is a smart chap :)
Like yourself perhaps ScientificBoysClub?
I am just a student ... i am not that smart and soon I will be ...
You're so modest

------
Alright, enough of this chat... I am going to sleep.
 

Offline DoctorBeaver

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If water is blue, why is snow white?
« Reply #22 on: 02/03/2009 09:51:23 »
We're not all human, you know!  [:(!]
 

ScientificBoysClub

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If water is blue, why is snow white?
« Reply #23 on: 02/03/2009 12:56:47 »
We're not all human, you know!  [:(!]

yeah u must be an alien
 

Offline danpetersrocks

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If water is blue, why is snow white?
« Reply #24 on: 02/03/2009 13:20:56 »
you do also get yellow snow!
 

The Naked Scientists Forum

If water is blue, why is snow white?
« Reply #24 on: 02/03/2009 13:20:56 »

 

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