Re: silica gel

ASAAR <caught@xxxxxx> wrote:
On Sun, 26 Feb 2006 06:29:23 -0900, Floyd L. Davidson wrote:

Reality check: That one is particularly *hilarious*.

Q: What about the dangerous radiation?!!

A: Microwave ovens don't use "radiation." Instead they use
radio waves. ...

Exactly how do you think radio waves are propagated? Carried in
buckets, or perhaps, they might be radiated?

The cited source says it is not being radiated!

Like I said, *hilarious*.

Your source, not mine. But you seem unable to see the distinction

No, that is not *my* source. Please to try to keep track of details.
That was posted to support what *you* said.

between the radiation emitted by a radio transmitter and the
radiation emitted by a radioactive substance. How do you tell when

The statement that it is not radiation is absurd. Your support for
that sort of absurdity has been noted previously.

food has been properly cooked in the microwave oven, with a Geiger
counter? Your trollishness is not very subtle.

Look up radiation, and such things as light and radio waves.
Stop calling other people names with descriptions that fit
*your* statements.

Reputable sources recommend to include with the dishes or utensils
that need to be checked, a small container of water.

So you admit those particular ones are *not* reputable...

Why should I? I haven't seen the internet sites that made the
claims you attributed to them, nor do I have any interest in doing
so.

So when people post cites, you don't check them out? You just
stick with whatever you already think you know?

That cite was posted to support *your* claims, and I checked it
out and have pointed out that it is not credible.

But you're only compounding your foolishness.

Such as your idea that a microwave oven can't be operated empty?

Do you realize that probably not one microwave has been sold in
the US since the early 70's that would not operate full period
when empty? That's right, microwave ovens did not become
popular *until* that particular characteristic was part of the
basic design.

Or are you talking about your claim that microwaves energy is
not radiation?

Electromagnetic Radiation (EMR):
Radiation made up of oscillating electric and magnetic
fields and propagated with the speed of light. Includes
gamma radiation, X-rays, ultraviolet, visible, and
infrared radiation, and radar and radio waves.

That is from http://www.its.bldrdoc.gov/fs-1037/ which is the
Federal Standard 1037C resource site.

The claims
they've made can be valid yet not conflict in any way with what I
said.

Oh, more hilarious statements! You are so funny!

In the case of the microwave ovens, testing containers or
utensils for 15 to 30 seconds is probably not long enough to
severely overheat the microwave's tube, so that probably can be done
without damage, but it entails a bit of risk if the oven is operated
that way for too long.

That's why there are dozens upon dozens of sites that say the
same thing as this (recounting early microwave oven history),

Litton then developed a new configuration of the microwave,
the short, wide shape that is now common. The magnetron feed
was also unique. This resulted in an oven that could survive a
no-load condition indefinitely. The new oven was shown at a
trade show in Chicago, and helped begin a rapid growth of the
market for home microwave ovens.
http://everist.org/special/mw_oven/

And continue with statements like this,

However, surely one of the worst cases for power reflection
would be from a completely empty oven cavity. If a magnetron
can survive that (common) situation, then it should be able
to survive any other form of cavity load, right up to the
almost total absorption (heavy load) presented by (say) a
large roast.
http://everist.org/special/mw_oven/

That's why designers say things like this,

A no-load protector minimizes damage to the magnetron tube
when the oven is operated without "high-loss" (watery)
material in it. Almost all commercial units designed for home
use meet these criteria.
www.asbcnet.org/journal/pdfs/backissues/38-0142.pdf

Or this,

The construction also protected the magnetron from damage due
to overheating or mode shifting by the use of a four spoke
radial aperture in the top of the cavity. When the generator
was accidentally energized with no load, the microwaves passed
harmlessly, out these coupling slots.
http://www.smecc.org/microwave_oven_holding_page.htm

That's why NASA says this, right?

New advances in the state of the art brought inexpensive and
reliable solutions to both problems. A lossy glass or ceramic
shelf now serves as a medium which can absorb the microwave
energy, thus negating the requirement for a no-load
sensor.
http://history.nasa.gov/SP-202/sess6.3.htm

This is why the books or instructions I've
seen always say to additionally include a water filled container.

Look, there is no point in making things up. You can find that
garbage on the Internet, and you may have seen one microwave
oven with instructions that say that, but few if any of them do.

If the microwave tubes didn't *need* protection, that advisory
wouldn't have been made.

Somebody said it on the Internet so it has to be true, eh?

Some people not realizing what's going on
might be tempted to let the microwave oven run for 20 minutes if
they don't detect any warmth in the container after only 20 seconds.
If they do that they'd better have added the water filled container.

Why? It won't make a bit of difference.

--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) floyd@xxxxxxxxxx
.

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