It's a capital Q with a dot above representing "heat transfer per unit time" (or rate of heat transfer). Similar thermodynamic symbols are Ẇ (rate of work produced) and ṁ (rate of mass transfer)...and interestingly these DO exist in Unicode.
Since the system has constant volume (ΔV=0) the term -PΔV=0 and work is equal to zero. Thus, in the equation ΔU=q+w w=0 and ΔU=q. The internal energy is equal to the heat of the system....Introduction.ProcessSign of heat (q)Sign of Work (w)Heat released from the system- exothermic (absorbed by surroundings)-N/A•Aug 15, 2020
mechanical equivalent of heat. noun. physics a factor for converting units of energy into heat units. It has the value 4.1868 joules per calorieSymbol: J. J.
J is the Joule's constant. U is the internal energy of the system. For any process, the heat supplied to the system is either used to give some work output or is used to increase the internal energy of the system. Which is the first law of thermodynamics.
Though a standardised value of 4.1860 J·cal−1 was established in the early 20th century, in the 1920s, it was ultimately realised that the constant is simply the specific heat of water, a quantity that varies with temperature between the values of 4.17 and 4.22 J·g−1·°C−1.
This is Joule's law and J is called mechanical equivalent of heat. (1) From W = JQ if Q = 1 then J = W. Hence the amount of work done necessary to produce unit amount of heat is defined as the mechanical equivalent of heat.
Q=W when we consider SI units. So W=JQ is practically of no use but it forms the base for building the concepts.
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