mechanical equivalent of heat การใช้

• Joule's apparatus for measuring the mechanical equivalent of heat.
• The other was a new determination of the mechanical equivalent of heat.
• In 1843, James Joule experimentally found the mechanical equivalent of heat.
• He presented a value in numerical terms for the mechanical equivalent of heat.
• Using these values, Joule was able to determine the mechanical equivalent of heat.
• Rumford made no attempt to further quantify the heat generated or to measure the mechanical equivalent of heat.
• This statement came to be known as the mechanical equivalent of heat and was a precursory form of the first law of thermodynamics.
• Mayer not only performed this demonstration, but determined also the quantitative factor of the transformation, calculating the mechanical equivalent of heat.
• Joule estimated a mechanical equivalent of heat to be 819 ft " lbf / Btu ( 4.41 J / cal ).
• In June 1845, Joule read his paper " On the Mechanical Equivalent of Heat " to the British Association meeting in Cambridge.
• His achievements were overlooked and priority for the discovery of the " mechanical equivalent of heat " was attributed to James Joule in the following year.
• He is particularly noted for inventing a device for determining the mechanical equivalent of heat that was exhibited at the " Exposition Universelle ", Paris, 1878.
• :: : We actually have an article on the mechanical equivalent of heat, which involves the direct measurement of the heat produced by mechanical agitation of a liquid ( usually water ).
• The constant of proportionality is universal and independent of the system and in 1845 and 1847 was measured by James Joule, who described it as the " mechanical equivalent of heat ".
• By 1850, Colding had obtained a value for the mechanical equivalent of heat, some 14 % lower than the cal  " 1 ) at a time when Joule had measured 4.159 J穋al  " 1.
• Similar to how the " Reflections " was the precursor to the second law, English physicist James Joule's 1843 paper " Mechanical equivalent of heat " was the precursor to the first law of thermodynamics.
• James Prescott Joule had been inspired to his investigations into the mechanical equivalent of heat by comparing the mass of coal consumed in a steam engine with the mass of zinc consumed in a Grove battery in performing a common quantity of mechanical work.
• His theory was at once mathematical and mechanical : it contained the principle of the conservation of heat ( later understood as an instance of conservation of energy ) and even contained the concept ( although not the label ) of the mechanical equivalent of heat.
• In this work, he went on to state that " the quantities of heat evolved are, in every case, proportional to the lost moving forces " though he did not calculate a mechanical equivalent of heat as Joule was to do in the same year.
• The idea that a calorie of sunlight is not equivalent to a calorie of fossil fuel or electricity strikes many as absurd, based on the 1st Law definition of energy units as measures of heat ( i . e . Joule's mechanical equivalent of heat ).