Sunsets in paris...
Oct 25th 2004, 5:59 am
#196
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Re: Sunsets in paris...
On Sun, 24 Oct 2004 08:04:36 +0200, Mxsmanic
<[email protected]> wrote:
>randee writes:
>> Water vapor is fairly transparent in certain important parts of the
>> spectrum, not so transparent in other parts (e.g. the infrared).
>Infrared is so called because you cannot see it to begin with.
It's the "fairly transparent" that is important here.
************* DAVE HATUNEN ([email protected]) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *
<[email protected]> wrote:
>randee writes:
>> Water vapor is fairly transparent in certain important parts of the
>> spectrum, not so transparent in other parts (e.g. the infrared).
>Infrared is so called because you cannot see it to begin with.
It's the "fairly transparent" that is important here.
************* DAVE HATUNEN ([email protected]) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *
Oct 25th 2004, 6:01 am
#197
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Re: Sunsets in paris...
On Sun, 24 Oct 2004 10:35:39 +0200, [email protected] wrote:
>On Sun, 24 Oct 2004 08:03:47 +0200, Mxsmanic <[email protected]>
>wrote:
>>Jeremy Henderson writes:
>>> Girls look prettier when the temperature is high ...
>>Do they? I don't consider sweat attractive.
>Horses sweat, pretty girls perspire.
Miss Hayworth glows...
************* DAVE HATUNEN ([email protected]) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *
>On Sun, 24 Oct 2004 08:03:47 +0200, Mxsmanic <[email protected]>
>wrote:
>>Jeremy Henderson writes:
>>> Girls look prettier when the temperature is high ...
>>Do they? I don't consider sweat attractive.
>Horses sweat, pretty girls perspire.
Miss Hayworth glows...
************* DAVE HATUNEN ([email protected]) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *
Oct 25th 2004, 6:27 am
#198
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Re: Sunsets in paris...
Mxsmanic <[email protected]> wrote:
> Ellie C writes:
>> What's not humidity? These visual effects occur when the air is humid.
> No, they occur when there is liquid water ... in the atmosphere.
And does that occur when it is humid or when it is not?
miguel
--
Hit The Road! Photos from 32 countries on 5 continents: http://travel.u.nu
> Ellie C writes:
>> What's not humidity? These visual effects occur when the air is humid.
> No, they occur when there is liquid water ... in the atmosphere.
And does that occur when it is humid or when it is not?
miguel
--
Hit The Road! Photos from 32 countries on 5 continents: http://travel.u.nu
Oct 25th 2004, 7:13 am
#199
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Re: Sunsets in paris...
On Mon, 25 Oct 2004 12:01:23 -0600, Hatunen <[email protected]> wrote:
>On Sun, 24 Oct 2004 10:35:39 +0200, [email protected] wrote:
>>On Sun, 24 Oct 2004 08:03:47 +0200, Mxsmanic <[email protected]>
>>wrote:
>>>Jeremy Henderson writes:
>>>> Girls look prettier when the temperature is high ...
>>>Do they? I don't consider sweat attractive.
>>Horses sweat, pretty girls perspire.
>Miss Hayworth glows...
but can you see her, when she steams ;-)
--
Martin
>On Sun, 24 Oct 2004 10:35:39 +0200, [email protected] wrote:
>>On Sun, 24 Oct 2004 08:03:47 +0200, Mxsmanic <[email protected]>
>>wrote:
>>>Jeremy Henderson writes:
>>>> Girls look prettier when the temperature is high ...
>>>Do they? I don't consider sweat attractive.
>>Horses sweat, pretty girls perspire.
>Miss Hayworth glows...
but can you see her, when she steams ;-)
--
Martin
Oct 25th 2004, 8:14 am
#200
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Re: Sunsets in paris...
Hatunen <[email protected]> wrote:
[]
> In other words, nothing is perfectly tranparent and consequently
> nothing is invisible (save, perhaps, a perfect vacuum); many
> substances are very transparent, though. But transparency has a
> technical definition; "invisible" needs definition and may be
> rather like "unique", in that a thing is either invisible or it's
> not.
I appreciated the clear explanation! It seems that, in pop science
anyway, the two terms are conflated when referring to water vapour.
David
--
David Horne- www.davidhorne.net
usenet (at) davidhorne (dot) co (dot) uk
[]
> In other words, nothing is perfectly tranparent and consequently
> nothing is invisible (save, perhaps, a perfect vacuum); many
> substances are very transparent, though. But transparency has a
> technical definition; "invisible" needs definition and may be
> rather like "unique", in that a thing is either invisible or it's
> not.
I appreciated the clear explanation! It seems that, in pop science
anyway, the two terms are conflated when referring to water vapour.
David
--
David Horne- www.davidhorne.net
usenet (at) davidhorne (dot) co (dot) uk
Oct 25th 2004, 1:35 pm
#201
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Re: Sunsets in paris...
Miguel Cruz writes:
> And does that occur when it is humid or when it is not?
It occurs when there is liquid water suspended in the atmosphere. The
humidity of the air is independent of this.
--
Transpose hotmail and mxsmanic in my e-mail address to reach me directly.
> And does that occur when it is humid or when it is not?
It occurs when there is liquid water suspended in the atmosphere. The
humidity of the air is independent of this.
--
Transpose hotmail and mxsmanic in my e-mail address to reach me directly.
Oct 25th 2004, 1:36 pm
#202
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Re: Sunsets in paris...
Hatunen writes:
> Thus the deliberate use of the qualifier "almost all". But are
> you very sure about optical fiber glass? It is transparent enough
> to use as a fiber optic, but I suspect in long enough lengths it
> too will show some color or dimness. The history of fiber optics
> has been one of searching for ever less absorptive glasses.
I know that it is extraordinarily transparent, but it has been some
years since I last read up on it. I presume it is even more transparent
now than it was when I read about it.
--
Transpose hotmail and mxsmanic in my e-mail address to reach me directly.
> Thus the deliberate use of the qualifier "almost all". But are
> you very sure about optical fiber glass? It is transparent enough
> to use as a fiber optic, but I suspect in long enough lengths it
> too will show some color or dimness. The history of fiber optics
> has been one of searching for ever less absorptive glasses.
I know that it is extraordinarily transparent, but it has been some
years since I last read up on it. I presume it is even more transparent
now than it was when I read about it.
--
Transpose hotmail and mxsmanic in my e-mail address to reach me directly.
Oct 25th 2004, 1:43 pm
#203
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Re: Sunsets in paris...
Hatunen writes:
> So, I guess you are willing to modify your claim as to the
> invisibilty of water vapor and steam to restrict its validity to
> meteorological phenomena..
No modification is required, since that was the original context.
--
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> So, I guess you are willing to modify your claim as to the
> invisibilty of water vapor and steam to restrict its validity to
> meteorological phenomena..
No modification is required, since that was the original context.
--
Transpose hotmail and mxsmanic in my e-mail address to reach me directly.
Oct 25th 2004, 2:42 pm
#204
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Re: Sunsets in paris...
On Tue, 26 Oct 2004 03:35:45 +0200, Mxsmanic wrote:
> Miguel Cruz writes:
>
>> And does that occur when it is humid or when it is not?
>
> It occurs when there is liquid water suspended in the atmosphere. The
> humidity of the air is independent of this.
Usually when that occurs, the air is saturated though.
> Miguel Cruz writes:
>
>> And does that occur when it is humid or when it is not?
>
> It occurs when there is liquid water suspended in the atmosphere. The
> humidity of the air is independent of this.
Usually when that occurs, the air is saturated though.
Oct 25th 2004, 5:02 pm
#205
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Re: Sunsets in paris...
Mxsmanic wrote:
> Ellie C writes:
>
>
>>What's not humidity? These visual effects occur when the air is humid.
>
>
> No, they occur when there is liquid water or other non-gaseous matter in
> the atmosphere.
>
Liquid water in the air - is this not humidity? 0% relative humidity =>
no water in the air; 100% relative humidity => the air is holding all
the water possible at its temperature.
> Ellie C writes:
>
>
>>What's not humidity? These visual effects occur when the air is humid.
>
>
> No, they occur when there is liquid water or other non-gaseous matter in
> the atmosphere.
>
Liquid water in the air - is this not humidity? 0% relative humidity =>
no water in the air; 100% relative humidity => the air is holding all
the water possible at its temperature.
Oct 25th 2004, 6:30 pm
#206
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Re: Sunsets in paris...
Ellie C writes:
> Liquid water in the air - is this not humidity?
No.
> 0% relative humidity => no water in the air; 100% relative
> humidity => the air is holding all the water possible at
> its temperature.
In both cases, the water is in a gaseous state, not a liquid.
--
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> Liquid water in the air - is this not humidity?
No.
> 0% relative humidity => no water in the air; 100% relative
> humidity => the air is holding all the water possible at
> its temperature.
In both cases, the water is in a gaseous state, not a liquid.
--
Transpose hotmail and mxsmanic in my e-mail address to reach me directly.
Oct 25th 2004, 7:10 pm
#207
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Re: Sunsets in paris...
Mxsmanic <[email protected]> wrote:
> Miguel Cruz writes:
>> And does that occur when it is humid or when it is not?
> It occurs when there is liquid water suspended in the atmosphere. The
> humidity of the air is independent of this.
Not independent at all. There's a very strong correlation.
miguel
--
Hit The Road! Photos from 32 countries on 5 continents: http://travel.u.nu
> Miguel Cruz writes:
>> And does that occur when it is humid or when it is not?
> It occurs when there is liquid water suspended in the atmosphere. The
> humidity of the air is independent of this.
Not independent at all. There's a very strong correlation.
miguel
--
Hit The Road! Photos from 32 countries on 5 continents: http://travel.u.nu
Oct 26th 2004, 1:06 am
#208
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Posts: n/a
Re: Sunsets in paris...
On 2004-10-26 03:35:45 +0200, Mxsmanic <[email protected]> said:
> Miguel Cruz writes:
>
>> And does that occur when it is humid or when it is not?
>
> It occurs when there is liquid water suspended in the atmosphere. The
> humidity of the air is independent of this.
Do you remember the weather last Tuesday here in Paris? In the morning
it was quite warm, and very humid. In the evening there was torrential
rain. No doubt in Mixup-world those two things were independent.
The next morning the air was quite dry, and there were few clouds in
the sky. More coincidence.
J;
--
Encrypted e-mail address. Click to mail me:
http://cerbermail.com/?nKYh3qN4YG
> Miguel Cruz writes:
>
>> And does that occur when it is humid or when it is not?
>
> It occurs when there is liquid water suspended in the atmosphere. The
> humidity of the air is independent of this.
Do you remember the weather last Tuesday here in Paris? In the morning
it was quite warm, and very humid. In the evening there was torrential
rain. No doubt in Mixup-world those two things were independent.
The next morning the air was quite dry, and there were few clouds in
the sky. More coincidence.
J;
--
Encrypted e-mail address. Click to mail me:
http://cerbermail.com/?nKYh3qN4YG
Oct 26th 2004, 3:08 am
#209
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Re: Sunsets in paris...
On Tue, 26 Oct 2004 03:36:54 +0200, Mxsmanic
<[email protected]> wrote:
>Hatunen writes:
>> Thus the deliberate use of the qualifier "almost all". But are
>> you very sure about optical fiber glass? It is transparent enough
>> to use as a fiber optic, but I suspect in long enough lengths it
>> too will show some color or dimness. The history of fiber optics
>> has been one of searching for ever less absorptive glasses.
>I know that it is extraordinarily transparent, but it has been some
>years since I last read up on it. I presume it is even more transparent
>now than it was when I read about it.
Which is why I said: "The history of fiber optics has been one of
searching for ever less absorptive glasses."
************* DAVE HATUNEN ([email protected]) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *
<[email protected]> wrote:
>Hatunen writes:
>> Thus the deliberate use of the qualifier "almost all". But are
>> you very sure about optical fiber glass? It is transparent enough
>> to use as a fiber optic, but I suspect in long enough lengths it
>> too will show some color or dimness. The history of fiber optics
>> has been one of searching for ever less absorptive glasses.
>I know that it is extraordinarily transparent, but it has been some
>years since I last read up on it. I presume it is even more transparent
>now than it was when I read about it.
Which is why I said: "The history of fiber optics has been one of
searching for ever less absorptive glasses."
************* DAVE HATUNEN ([email protected]) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *
Oct 26th 2004, 3:21 am
#210
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Posts: n/a
Re: Sunsets in paris...
On Tue, 26 Oct 2004 07:02:45 +0200, Ellie C
<[email protected]> wrote:
>Mxsmanic wrote:
>> Ellie C writes:
>>
>>
>>>What's not humidity? These visual effects occur when the air is humid.
>>
>>
>> No, they occur when there is liquid water or other non-gaseous matter in
>> the atmosphere.
>>
>Liquid water in the air - is this not humidity?
No. It is not. Liquid water in the air is fog, not humidity.
However, if the air temperature is above the dew point (not
saturated) the fog will quickly evaporate into gaseous water
vapor, and that is humidity.
> 0% relative humidity => no water in the air;
Well, yes. I could come up with some abstruse situations where
the air can be at 0% relative humidity but a given volume will
contain liquid water. Briefly. For instance, we here in Arizona
are familiar with the phenomenon of having a relative humidity
of, say, 50% even while it is pouring rain. Again, though, it is
a transient condition.
>100% relative humidity => the air is holding all
>the water possible at its temperature.
Not quite: 100% relative humidity the air is holding all the
water *vapor* it can at its temperature. Should the temperature
drop slightly, some of the water vapor will condense into liquid
droplets called "fog", and the air will be holding more water
than it can hold water vapor. In fact, that's why the fog forms.
************* DAVE HATUNEN ([email protected]) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *
<[email protected]> wrote:
>Mxsmanic wrote:
>> Ellie C writes:
>>
>>
>>>What's not humidity? These visual effects occur when the air is humid.
>>
>>
>> No, they occur when there is liquid water or other non-gaseous matter in
>> the atmosphere.
>>
>Liquid water in the air - is this not humidity?
No. It is not. Liquid water in the air is fog, not humidity.
However, if the air temperature is above the dew point (not
saturated) the fog will quickly evaporate into gaseous water
vapor, and that is humidity.
> 0% relative humidity => no water in the air;
Well, yes. I could come up with some abstruse situations where
the air can be at 0% relative humidity but a given volume will
contain liquid water. Briefly. For instance, we here in Arizona
are familiar with the phenomenon of having a relative humidity
of, say, 50% even while it is pouring rain. Again, though, it is
a transient condition.
>100% relative humidity => the air is holding all
>the water possible at its temperature.
Not quite: 100% relative humidity the air is holding all the
water *vapor* it can at its temperature. Should the temperature
drop slightly, some of the water vapor will condense into liquid
droplets called "fog", and the air will be holding more water
than it can hold water vapor. In fact, that's why the fog forms.
************* DAVE HATUNEN ([email protected]) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *
