Re: Laptop vs. Charts

On 2007-12-03, Davoud <star@xxxxxxx> wrote:

3) Laptops have LCD displays. The "L" stands for "liquid," and liquid
can freeze if it's cold enough. If the "L" freezes it will expand and
destroy your display. In use, Cold-Cathode Flourescent Lamp (CCFL)
backlights on older laptops generate a small amount of heat in spite of
their name; I don't know if this is the case with the latest models,
which have LED backlights. In any case, if it's cold enough to freeze
your "L", it's cold enough to freeze your "A," so quit for the night,
and take your laptop in with you.

Two points. Firstly an LCD is a (Liquid Crystal) Display and not
a Liquid (Crystal Display). That is the technology uses liquid
crystals rather than actual liquids. Liquid crystals are a curious
state of matter that falls inbetween conventional liquid and solid
states. Having said that, they could still freeze solid although
I am not sure how far the temperature needs to drop for that to
happen - it isn't water after all.

Secondly, although it pains me to say it (sometimes literally!)
the coldest nights are often extrememely useful for astronomy since
in my experience at least, they tend to have the best transparency.
My (suburban) back yard has a typical NELM of 2.8-3.2 under normal
weather conditions. If the temperature drops to 0C or thereabouts
it isn't unusal for it to hit 4.0, perhaps better. Seeing isn't
always up to much in these conditions but at times there simply
isn't any substitute for darker than normal skies.

--
Andrew Smallshaw
andrews@xxxxxxxxxxxxxxxx
.

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