| Topic: |
Science > Physics |
| User: |
"" |
| Date: |
26 Aug 2005 01:09:43 PM |
| Object: |
household physics question |
This is my first post to this group. I am not a scientist, but from
time to time I am puzzled by some observed phenomenon or other. Perhaps
one of you will be able to answer this:
When I run my dishwasher it usually includes a mix of glass, metal and
plastic items. I let the load drip dry over night to save energy. In
the morning all the metal and glass objects are dry, but the plastic
ones are covered with droplets as if they had been washed only moments
before. Perhaps you have observed the same phenomenon.
Why does the moisture evaporate from the plastic surfaces so much
slower than from glass and metal?
Thanks in advance.
Andy
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| User: "Sam Wormley" |
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| Title: Re: household physics question |
26 Aug 2005 02:38:17 PM |
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wrote:
This is my first post to this group. I am not a scientist, but from
time to time I am puzzled by some observed phenomenon or other. Perhaps
one of you will be able to answer this:
When I run my dishwasher it usually includes a mix of glass, metal and
plastic items. I let the load drip dry over night to save energy. In
the morning all the metal and glass objects are dry, but the plastic
ones are covered with droplets as if they had been washed only moments
before. Perhaps you have observed the same phenomenon.
Why does the moisture evaporate from the plastic surfaces so much
slower than from glass and metal?
One factor might be "surface wetting"... The hydrogen bonds cause
the water droplets to tend to bead up (and more so on plastic
surfaces), thus slowing the effective evaporation rate as compared
to the metal and glass surfaces where water "spreads" resulting
in greater surface area.
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| User: "Uncle Al" |
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| Title: Re: household physics question |
26 Aug 2005 02:50:32 PM |
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wrote:
[snip]
When I run my dishwasher it usually includes a mix of glass, metal and
plastic items.
In crass violation of religious canon not yet written, but certainly
in violation of the Spirit of "Deuteronomy" and fabric segregation.
Yer gonna get a guided missal up yer kazoo when GOD takes over.
I let the load drip dry over night to save energy. In
the morning all the metal and glass objects are dry, but the plastic
ones are covered with droplets as if they had been washed only moments
before. Perhaps you have observed the same phenomenon.
Why does the moisture evaporate from the plastic surfaces so much
slower than from glass and metal?
Compare thermal conductivities of the respective materials. It's
almost 600 cal/gram to evaporate water at room temp.
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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| User: "tj Frazir" |
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| Title: Re: household physics question |
26 Aug 2005 08:16:59 PM |
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Friction is less for glass and steel.
The water wount evaporate inside te dishwasher and so gravity runs the
water off .
It will take longer for the plastic to drain off.
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| User: "" |
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| Title: Re: household physics question |
26 Aug 2005 01:45:35 PM |
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I think the most likely explanation is that the glass and metal items
in your dishwasher retain heat better than your plastic items, thereby
causing the water to evaporate sooner. This is just a guess.
at@2walla.com wrote:
This is my first post to this group. I am not a scientist, but from
time to time I am puzzled by some observed phenomenon or other. Perhaps
one of you will be able to answer this:
When I run my dishwasher it usually includes a mix of glass, metal and
plastic items. I let the load drip dry over night to save energy. In
the morning all the metal and glass objects are dry, but the plastic
ones are covered with droplets as if they had been washed only moments
before. Perhaps you have observed the same phenomenon.
Why does the moisture evaporate from the plastic surfaces so much
slower than from glass and metal?
Thanks in advance.
Andy
.
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| User: "" |
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| Title: Re: household physics question |
26 Aug 2005 01:45:36 PM |
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I think the most likely explanation is that the glass and metal items
in your dishwasher retain heat better than your plastic items, thereby
causing the water to evaporate sooner. This is just a guess.
at@2walla.com wrote:
This is my first post to this group. I am not a scientist, but from
time to time I am puzzled by some observed phenomenon or other. Perhaps
one of you will be able to answer this:
When I run my dishwasher it usually includes a mix of glass, metal and
plastic items. I let the load drip dry over night to save energy. In
the morning all the metal and glass objects are dry, but the plastic
ones are covered with droplets as if they had been washed only moments
before. Perhaps you have observed the same phenomenon.
Why does the moisture evaporate from the plastic surfaces so much
slower than from glass and metal?
Thanks in advance.
Andy
.
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| User: "" |
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| Title: Re: household physics question |
26 Aug 2005 02:29:39 PM |
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I agree with crowsmenge...@gmail.com's first answer, but not his/her
second.
Spock: "I love you, Trudy #276, but I hate Trudy #975" (or some-such
names as those)
Trudy #975: "But I am identical in every respect to Trudy #276"
Spock: "That's precisely why I love her!!!!!"
Trudy #276 and #975: "Beep beep beep beep beep..."
"Logic is a little bird tweeting in a tree, that smells bad."
Law # 1 : "Fantastic insight into the true nature of reality is
isomorphic to insanity; however, sleep clears it up if you're
manic-depressive. If your schizophrenic, you're out of luck."
Law # 2: " Arthur C. Clarke was a pessimist."
Law # 3 " Metasupercivilizations/Global Brains do not self-organize on
a planet linearly; they arrive explosively, like a detonating H-bomb
(assuming no actual H-bombs are used to annihilate the planet). No one
notices it all due to the "rising ship raises all boats" effect.
Law # 4 - TBD
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| User: "T Wake" |
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| Title: Re: household physics question |
26 Aug 2005 04:22:09 PM |
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<donstockbauer@hotmail.com> wrote in message
news:1125084579.626749.187090@f14g2000cwb.googlegroups.com...
Oh my. That will never pass a Turing test.
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| User: "Edward Green" |
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| Title: Re: household physics question |
26 Aug 2005 05:12:30 PM |
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T Wake wrote:
<donstockbauer@hotmail.com> wrote in message
news:1125084579.626749.187090@f14g2000cwb.googlegroups.com...
Oh my. That will never pass a Turing test.
Because it was too clever for the run of the mill human?
I'm wondering if that was some actual Startrek dialogue from an episode
where they visit a planet full of clones, with something in the air
which causes Spock et al. to lose their minds, or a simulation of such
an episode.
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