Chancellor Of The Duchy Of Besses O' Th' Barn

Jeremy Henderson <[email protected]> wrote:

    > On 2004-10-23 12:19:14 +0200, [email protected]
    > (chancellor of the duchy of besses o' th' barn) said:
    >
    > > Jeremy Henderson <[email protected]> wrote:
    > >
    > >> On 2004-10-23 10:22:07 +0200, [email protected]
    > >> (chancellor of the duchy of besses o' th' barn) said:
    > >>
    > >>> Jeremy <[email protected]> wrote:
    > >>>
    > >>> No. He's correct in the sense that he is, well, correct.
    > >>
    > >> But irrelevant, since the OP didn't mention water vapour.
    > >
    > > Yes, the OP did. Think about it.
    > >
    > > David
    >
    > Just go look:
    >
    > Ellie C wrote:
    >
    > > Humidity changes everything. Edges become blurrier, aerial
    > > perspetive has more effect the higher the humidity.
    >
    > Mixup replied:
    >
    > Water vapor is invisible.

Look up what humidity is.

David

--
David Horne- www.davidhorne.net
usenet (at) davidhorne (dot) co (dot) uk

Jeremy Henderson

On 2004-10-24 00:24:07 +0200, [email protected]
(chancellor of the duchy of besses o' th' barn) said:

    > Jeremy Henderson <[email protected]> wrote:
    >
    >> On 2004-10-23 12:19:14 +0200, [email protected]
    >> (chancellor of the duchy of besses o' th' barn) said:
    >>
    >>> Jeremy Henderson <[email protected]> wrote:
    >>>
    >>>> On 2004-10-23 10:22:07 +0200, [email protected]
    >>>> (chancellor of the duchy of besses o' th' barn) said:
    >>>>
    >>>>> Jeremy <[email protected]> wrote:
    >>>>>
    >>>>> No. He's correct in the sense that he is, well, correct.
    >>>>
    >>>> But irrelevant, since the OP didn't mention water vapour.
    >>>
    >>> Yes, the OP did. Think about it.
    >>>
    >>> David
    >>
    >> Just go look:
    >>
    >> Ellie C wrote:
    >>
    >>> Humidity changes everything. Edges become blurrier, aerial
    >>> perspetive has more effect the higher the humidity.
    >>
    >> Mixup replied:
    >>
    >> Water vapor is invisible.
    >
    > Look up what humidity is.

I might suggest you do the same thing. To give you a clue, humidity is
a quantity, not a substance. To say that things look different when
humidity is high is not the same as saying that things look different
when there is water vapour in the atmosphere. (Girls look prettier when
the temperature is high, but it's nothing to do with kinetic energy of
air molecules :-)

J;

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Chancellor Of The Duchy Of Besses O' Th' Barn

Jeremy Henderson <[email protected]> wrote:

[]
    > I might suggest you do the same thing. To give you a clue, humidity is
    > a quantity, not a substance.

Indeed. So, what is humidity a measure of?

David

--
David Horne- www.davidhorne.net
usenet (at) davidhorne (dot) co (dot) uk

Chancellor Of The Duchy Of Besses O' Th' Barn

Hatunen <[email protected]> wrote:

    > On Sat, 23 Oct 2004 08:45:46 +0200, Mxsmanic
    > <[email protected]> wrote:
    >
    > >Hatunen writes:
    > >
    > >> Wrong.
    > >
    > >Well, that's certainly persuasive.
    >
    > I'm not trying to persuade you.

As a non-specialist, I wouldn't mind being persuaded. All the googling I
do comes up with "water vapo(u)r is invisible" and "water vapo(u)r is
transparent to light" and so on- that's on sites that seem fairly up on
the subject. So, assuming this isn't just an exercise in semantics,
what's the deal?

David

--
David Horne- www.davidhorne.net
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Randee

Actually no, it is the partial pressure of water vapor (dew point is a
typical measure) which indicates the amount of water vapor in the air.
Humidity is really 'relative humidity', and is a function of
temperature. The R.H. numbers given in the met forecasts are the
percentage moisture saturation of the air. 20% RH means that the air is
holding 20% of the moisture it could at that temperature. At 100% RH
you will get visible condensation - mist, dew, frost, etc., and you can
get this visible condensation by simply lowering the temperature for a
given partial pressure of water vapor.
--
wf.

Jeremy Henderson wrote:

    >
    > Surely humidity is the *amount* of water vapour in the air? As such it
    > doesn't help or hinder the viewing of anything, but as I stated above,
    > a high humidity implies a high propensity for condensation to occur.
    > That's simply common sense - a rare commodity round here, admittedly.

Randee

Water vapor is fairly transparent in certain important parts of the
spectrum, not so transparent in other parts (e.g. the infrared).
--
wf.

Hatunen wrote:
    >
    > On Fri, 22 Oct 2004 19:47:59 +0200, Mxsmanic
    > <[email protected]> wrote:
    >
    > >Hatunen writes:
    > >
    > >> You're confusing invisibility with transparency.
    > >
    > >Water vapor is both.
    >
    > Wrong.

Mxsmanic

Hatunen writes:

    > Almost all glasses have a color when you look in them edgewise,
    > but not necessarily quartz.

The glasses used for optical fibers don't. You can look through
kilometres of that glass and see no color at all. In fact, if the ocean
were filled with that glass instead of water, you'd easily be able to
see the bottom, and it would be lit with sunshine.

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Mxsmanic

Jeremy Henderson writes:

    > Girls look prettier when the temperature is high ...

Do they? I don't consider sweat attractive.

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Mxsmanic

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.

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Mxsmanic

Hatunen writes:

    > Um. That's what I'm talking about.

Perhaps, but they are not a feature of normal weather.

    > BTW, during my career as a power plant construction
    > engineer I've seen steamline blowdowns, and beleive
    > me, the st4eam is quite visible.

Steamline blowdowns are not a part of normal terrestrial meteorology.

    > You are aware that sunsets seen from low orbit are affected by
    > the atmosphere, and look quite different from sunsets on airless
    > bodies, due to the refraction of the air?

There is always air in the atmosphere on Earth.

    > And...?

Lighter means not more dense.

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Miguel Cruz

Mxsmanic <[email protected]> wrote:
    > Hatunen writes:
    >> Almost all glasses have a color when you look in them edgewise,
    >> but not necessarily quartz.
    > The glasses used for optical fibers don't. You can look through
    > kilometres of that glass and see no color at all. In fact, if the ocean
    > were filled with that glass instead of water, you'd easily be able to
    > see the bottom, and it would be lit with sunshine.

Fishing would be a real pain though.

miguel
--
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nitram

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.
--
Martin

Jeremy Henderson

On 2004-10-24 00:58:36 +0200, [email protected]
(chancellor of the duchy of besses o' th' barn) said:

    > Jeremy Henderson <[email protected]> wrote:
    >
    > []
    >> I might suggest you do the same thing. To give you a clue, humidity is
    >> a quantity, not a substance.
    >
    > Indeed. So, what is humidity a measure of?

It's a measure of concentration of water vapour, and it's also an
indicator of a number of side-effects. The temperature/kinetic energy
of air molecules analogy is apt. The two are not equivalent in
implication, or you'd have people wandering round in summer going "My,
what a high level of kinetic energy of air molecules we have today",
which they clearly don't. Well, maybe Mixup does...

J;

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Jeremy Henderson

On 2004-10-24 08:03:47 +0200, Mxsmanic <[email protected]> said:

    > Jeremy Henderson writes:
    >
    >> Girls look prettier when the temperature is high ...
    >
    > Do they? I don't consider sweat attractive.

Plus they smell more - stale perfume, tobacco, sex ... wonderful.

J;
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Howie

Ericka wrote:
    > I've noticed this newsgroup gets read by some people that actually lives in
    > Paris.
    > So, I wanted to ask what month/season gives (usually) the better sunsets in
    > Paris?
    > I know it's probably a childish question, but hey, that's how I am :)
    >
    > Thanks!

Been to Paris almost every month of the year, Ericka. I like sunset in
the summer, which can occur as late as 11PM.

Howie