huvitav teada
Get flash to fully experience Pearltrees
Päijännetunneli
Päijännetunnelin kartta . 1) Asikkalanselkä 2) Kalliomäen jakelupumppaamo sekä voimalaitos 3) Korpimäen pumppausasema 4) Silvolan tekojärvi Päijännetunneli on Päijänteestä Helsingin seudulle johtava raakavesitunneli [1] , joka tuo vettä noin miljoonan asukkaan ja teollisuuden käyttöön. 120 kilometriä pitkänä se on maailman toiseksi pisin tunneli heti New York Cityyn vettä kuljettavan 137 kilometrin pituisen Delawaren vesitunnelin jälkeen.Incandescent light bulb
A 230-volt incandescent light bulb, with a 'medium' sized E27 (Edison 27 mm) male screw base. The filament is visible as the horizontal line between the vertical supply wires. An incandescent light bulb , incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows (see Incandescence ).
TFT Central
Panel Technologies TN Film, MVA, PVA and IPS Explained Simon Baker, updated 30 April 2011
If you live in a place that has lots of snow and ice in the winter, then you have probably seen the highway department spreading salt on the road to melt the ice. You may have also used salt on ice when making home-made ice cream.
Why do they use salt to melt ice on the road in the winter?"
FAQ: Solutions: Why can adding salt to ice water make the ice melt slower?
Yes. Adding salt to the ice/water mix causes a temperature drop that slows the melting rate and increases the freezing rate [ 3 ]. The net result is that the ice melts more and more slowly after the initial addition of salt.
23 November 2011 Last updated at 10:01 By Ella Davies Reporter, BBC Nature As brine from the sea ice sinks, a 'brinicle' forms threatening life on the sea floor with a frosty fate.
