| Dulong and Petit's law |
The Dulong-Petit law, found in 1819 by Pierre Louis Dulong and Alexis Thérèse Petit, states the classical expression for the specific heat capacity of a crystal due to its lattice vibrations. The result is extremely simple: regardless of the nature of the crystal, the specific heat capacity is equal to 3R/M, where R is the gas constant and M is the molar mass. ...
출처: en.wikipedia.org/wiki/Dulong_and_Petit's_law
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| dumbbell |
A dumbbell is a piece of equipment used in weight training. It is a weight that is held in one hand. Dumbbells therefore normally come in pairs. ...
출처: en.wikipedia.org/wiki/Dumbbell
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| dummy |
Dummy, released in 1994, was the debut album of the Bristol-based group Portishead. Building on the promise of their earlier EP, "Numb", it helped to cement the reputation of Bristol as the capital of "trip hop", a nascent genre which was then often referred to simply as "the Bristol sound". ...
출처: en.wikipedia.org/wiki/Dummy_(album)
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| dumping syndrome |
The dumping syndrome, or rapid gastric emptying, happens when the lower end of the small intestine fills too quickly with undigested food from the stomach. The early symptoms of dumping syndrome are caused by a rapid flow of food into the intestines which lowers blood volume by drawing fluid from the blood into the intestines to dilute the food and causes a very high rise in blood sugar. Symptoms may begin during or right after a meal. ...
출처: en.wikipedia.org/wiki/Dumping_syndrome
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| duplex |
A duplex locomotive is a steam locomotive that divides the driving force on its wheels by using two pairs of cylinders. With one pair of cylinders, set at ninety degrees apart to prevent a dead spot, there is an inbalance caused by the reciprocating action of the pistons and valve gear. Though some of this can be countered by weights on the wheels, this unbalances the wheels and results in the track being pounded, a phenomenon called hammer blow. ...
출처: en.wikipedia.org/wiki/Duplex_(locomotive)
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