| Topic: |
Science > Physics |
| User: |
"Donald G. Shead" |
| Date: |
01 Jul 2003 08:41:56 PM |
| Object: |
Water and the force of gravity; @ Earth's surface |
Pure water - rain or distilled - has a unique property in that it is a
substance that is at its maximum density while it is still in a liquid
state: For one thing, this allows it to freeze from the surface down to give
a protective cover for aquative life living in it.
For another thing, the maximun weight-density of water just prior to
freezing is about 62.4# per cubic foot, and 9.81 newtons per cubic
decimeter; which are used as the standard weight-density to which the
weight-density of all other material substances is compared:
The weight-density of any _unit_, a cubic foot, a cubic decimeter or any
unit, when divided by the weight-density of any similar unit of water is
called the specific gravity, and/or the relative density of that unit.
The specific gravity of water is "set" as one; which is the numeric value of
the density of water, when divided by iself(:-)
The heaviest substances like gold and platinum are more than 20 times as
heavy as water.
All material masses @ Earth's median surface; regardless of their weight,
and weight-density will free fall at a rate of displacement [s/t²] that is
proportional to their weight [w]: So that wt²/s is a constant for any body
of matter; at any given time or place: wt²/s = ft²/s.
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| User: "Herman Trivilino" |
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| Title: Re: Water and the force of gravity; @ Earth's surface |
01 Jul 2003 09:43:13 PM |
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"Donald G. Shead" <u10889@snet.net> wrote ...
The weight-density of any _unit_, a cubic foot, a cubic decimeter or any
unit, when divided by the weight-density of any similar unit of water is
called the specific gravity, and/or the relative density of that unit.
Units of volume, such as the cubic foot or cubic decimeter that you've
mentioned above, do not have a "weight-density". Density is a property of
substances, it's not a property of units of volume.
In the past you have claimed that there are not exactly 1000 grams in a
kilogram. Claims like this, and like the one above, are the types of
statements made by people who have the concepts of density and volume
confused.
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| User: "Donald G. Shead" |
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| Title: Re: Water and the force of gravity; @ Earth's surface |
02 Jul 2003 09:42:09 AM |
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"Herman Trivilino" <physhead@kingwoodREMOVECAPScable.com> wrote in message
news:3f024802$1_4@corp.newsgroups.com...
"Donald G. Shead" <u10889@snet.net> wrote ...
The weight-density of any _unit_, a cubic foot, a cubic decimeter or any
unit, when divided by the weight-density of any similar unit of water is
called the specific gravity, and/or the relative density of that unit.
Units of volume, such as the cubic foot or cubic decimeter that you've
mentioned above, do not have a "weight-density". Density is a property of
substances, it's not a property of units of volume.
In the past you have claimed that there are not exactly 1000 grams in a
kilogram. Claims like this, and like the one above, are the types of
statements made by people who have the concepts of density and volume
confused.
Herman, I'll reiterate: Weight-density is the ratio of a body's weight,
divided by it's volume; at sea level here on Earth the weight-density of
water is the standard to which the density of other materials is compared:
By dividing the weight-density of a material by the (standard)
weight-density of water, all of the units cancel, and we are left with _a
number_ that represents the specific gravity, and/or "relative density" of
that material. The specific gravity of any material is the same in the
English as it is in the metric systems of weights and measures.
My claim that there are not exactly 1000 grams in a kilogram actually
applies to the 'kilogram of the archives'. You know don't you that when they
made an artifact of platinum iridium to more permanently store safely in the
vault of the archives, that they couldn't make one that was exactly equal to
the [1000 gram] kilogram of water; so they voted to accept one that was
_almost_ so.
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| User: "Paul Cardinale" |
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| Title: Re: Water and the force of gravity; @ Earth's surface |
02 Jul 2003 09:13:40 AM |
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"Donald G. Shead" <u10889@snet.net> wrote in message news:<ELqMa.7386$5f6.2072856596@newssvr10.news.prodigy.com>...
[snip]
All material masses @ Earth's median surface; regardless of their weight,
and weight-density will free fall at a rate of displacement [s/t²]
False. Ineducable dolt. You have the learning capacity of a flea.
Paul Cardinale
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| User: "Donald G. Shead" |
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| Title: Re: Water and the force of gravity; @ Earth's surface |
02 Jul 2003 12:59:18 PM |
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"Paul Cardinale" <pcardinale@volcanomail.com> wrote in message
news:64050551.0307020613.1cc6bee0@posting.google.com...
"Donald G. Shead" <u10889@snet.net> wrote in message
news:<ELqMa.7386$5f6.2072856596@newssvr10.news.prodigy.com>...
[snip]
All material masses @ Earth's median surface; regardless of their
weight,
and weight-density will free fall at a rate of displacement [s/t²]
Finish what you started Dopey: All material masses @ Earth's median surface;
regardless of their weight, and weight-density will free fall at a rate of
displacement [s/t²]; WHICH IS NUMERICALLY EQUAL TO SIXTEEN FEET PER SECOND,
PER SECOND [= g/2].
That's the truth; according to none other than Galileo Galilee;^!
Cut<
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| User: "Uncle Al" |
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| Title: Re: Water and the force of gravity; @ Earth's surface |
02 Jul 2003 11:23:41 AM |
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"Donald G. Shead" wrote:
Pure water - rain or distilled - has a unique property in that it is a
substance that is at its maximum density while it is still in a liquid
state: For one thing, this allows it to freeze from the surface down to give
a protective cover for aquative life living in it.
Rainwater is full of crap, *****, especially partculates and
gasses.
Gallium, bismuth, silicon... all expand when they freeze. A large
number of compositions of matter monotonically expand as they cool,
typified by zirconum tungstate. Cordierite in your catalytic
converter (do they allow you to have a driver's license?) contracts
along one dimension as it warms. Zerodur. As usual, you are an
uneducated *****, *****.
For another thing, the maximun weight-density of water just prior to
freezing is about 62.4# per cubic foot, and 9.81 newtons per cubic
decimeter;
*****.
[snip]
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
"Quis custodiet ipsos custodes?" The Net!
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| User: "Donald G. Shead" |
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| Title: Re: Water and the force of gravity; @ Earth's surface |
02 Jul 2003 01:31:52 PM |
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"Uncle Al" <UncleAl0@hate.spam.net> wrote in message
news:3F03070D.899B4399@hate.spam.net...
"Donald G. Shead" wrote:
Pure water - rain or distilled - has a unique property in that it is a
substance that is at its maximum density while it is still in a liquid
state: For one thing, this allows it to freeze from the surface down to
give
a protective cover for aquative life living in it.
Rainwater is full of crap, *****, especially partculates and
gasses.
Yes Unk, and if it keeps getting worse we are in _deep_ crap: Pure water
from rain may require filtering and/or distilling.
Gallium, bismuth, silicon... all expand when they freeze. A large
number of compositions of matter monotonically expand as they cool,
typified by zirconum tungstate. Cordierite in your catalytic
converter (do they allow you to have a driver's license?) contracts
along one dimension as it warms. Zerodur. As usual, you are an
uneducated *****, *****.
Who besides you knew this when water was made the standard for
weight-density; that when the weight-density of any material is divided by
this water standard for weight-density, the quotient was the density of the
material relative to the density of water;^?
Who besides you can afford to use a lot of grant money to research such a
large number of these rare and expensively begotten compositions of
matter;^? Water's commonly available and a drink of it is still affordable.
Cut<
*****.
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