The internal energy is a state variable, just like the temperature or the pressure. The first law of thermodynamics defines the internal energy (E) as equal to the difference of the heat transfer (Q) into a system and the work (W) done by the system.E2 - E1 = Q-W We have emphasized the words into and by in the definition.hermodynamics is a branch of physics which deals with the energy and work of a system. Thermodynamics deals only with the large scale response of a system which we can observe and measure in experiments.
exists and is an alternate of . Meaning of Troy - What does the name Troy mean? Pronunciation: troi Gender: Boy Name Origin: English Name Meaning: Transferred use of the surname originating from the place-name Troyes in Aube, Normandy. Also, Troy means foot-soldier because of the invasion of Troyes, Greece.
Helen /he-len/ [2 sylls.] as a girls' name is pronounced HEL-en. It is of Greek origin, and the meaning of Helen is sun ray.Mythology: the abduction of Zeus's mortal daughter, Helen of Troy, resulted in the Trojan War. Hers was the face that launched a thousand ships. There was a Saint Helena, mother to Constantine the Great, whose purity allowed her to discover the True Cross.t is of Greek origin, and the meaning of Helen is sun ray. Mythology: the abduction of Zeus's mortal daughter, Helen of Troy, resulted in the Trojan War. Hers was the face that launched a thousand ships. There was a Saint Helena, mother to Constantine the Great, whose purity allowed her to discover the True Cross.