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The history of the Vaillant Group dates back to 1874, when Johann Vaillant set up a master fitter's business. In 1894 Johann Vaillant patented a new "closed-system" gas-fired bathroom boiler. [3] This was the first device that made it possible to heat water hygienically, without contaminating it with combustion gases.
Time-of-use metering and peak electrical loads: Tankless electric heaters, if installed in a large percentage of homes within an area, can create demand management problems for electrical utilities. Because these are high-current devices, and hot water use tends to peak at certain times of the day, their use can cause short spikes in ...
This Wikipedia page provides a comprehensive list of boiling and freezing points for various solvents.
The fugacity of a condensed phase (liquid or solid) is defined the same way as for a gas: = and = It is difficult to measure fugacity in a condensed phase directly; but if the condensed phase is saturated (in equilibrium with the vapor phase), the chemical potentials of the two phases are equal (μ c = μ g).
Phase behavior Triple point: 291.8 K (18.7 °C), ~99500 Pa Critical point: 850 K (577 °C), 7500 kPa Std enthalpy change of fusion, Δ fus H o: 18.28 kJ/mol Std entropy change
Young boy, possibly the brother of the artist, Mezzotint The painter Maria van Oosterwijck, 1671, by Wallerant Vaillant A couple painted by Wallerant Vaillant. ( Gemäldegalerie , Berlin) Wallerant Vaillant (30 May 1623 – 28 August 1677) was a painter of the Dutch Golden Age and one of the first artists to use the mezzotint technique, which ...
Marie Édouard Vaillant (26 January 1840 – 18 December 1915) was a French politician. Born in Vierzon , Cher , son of a lawyer, Édouard Vaillant studied engineering at the École Centrale des Arts et Manufactures , graduating in 1862, and then law at the Sorbonne .
Jehan Vaillant (fl. 1360–1390; also spelled Johannes Vayllant) was a French composer and music theorist. He is named immediately after Guillaume de Machaut by the Règles de la seconde rhétorique , which describes him as a "master … who had a school of music in Paris". [ 1 ]