Fr.: pôle Sud
1) An → imaginary point in the
→ southern hemisphere representing the intersection of the
→ Earth's → rotation axis with the
→ globe with the → celestial sphere.
Fr.: du Sud, méridional
Of or pertaining to the south.
M.E., O.E. suðerne, from suð, → south, + -erne, suffix denoting direction.
Daštari, relating to daštar, → south.
Fr.: Croix du Sud
Popular name for the constellation → Crux. Its four brightest stars form a distinctive cross shape.
Fr.: hémisphère sud
The transit of a celestial object, especially the Sun, across the meridian due south of the observer.
Verbal noun from → south (v.).
Fr.: règle de Trouton
The ratio of the → molar heat of vaporization of any liquid to its → boiling point is a constant, about 88 joules per mole per Kelvin. The rule is equivalent to the statement that the → entropy of vaporization is constant. It is not always followed, especially by liquids such as water in which hydrogen bonding occurs between the molecules.
Named after Frederick Thomas Trouton (1863-1922), an Irish physicist; → rule.
Fr.: expérience de Trouton-Noble
An experiment first carried out in 1903 to reveal the absolute motion of the Earth with respect to the → ether. The experiment consists of detecting a torque on a charged parallel-plate → capacitor that was suspended so that its plates were vertical. Since the Earth moves around the Sun, the moving charges were expected to produce magnetic fields, and the resulting torque should tend to turn the capacitor bringing its plates parallel to its velocity. No such effect was observed, and the absence of the torque supports the theory of → special relativity.
Named after Frederick T. Trouton (1863-1922) and Henry R. Noble; → experiment.
tanure-ye daryâyi (#)
Fr.: trombe marine
A spinning column of rising humid air that occurs over a body of warm water. Waterspouts fall within the class of atmospheric phenomena known as convective vortices that includes → tornadoes, → dust devils, and → hurricanes. They can feature wind speeds over 200 kilometers per hour.
→ water + spout, from M.E. spouten akin to M.Du. spiten "to spout;" O.E. spiwan "to spew."
Fr.: paradoxe de jeunesse
Same as → paradox of youth.