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  2. The first law of thermodynamics is a formulation of the law of conservation of energy in the context of thermodynamic processes. The law distinguishes two principal forms of energy transfer, heat and thermodynamic work, that modify a thermodynamic system containing a constant amount of matter.
    en.wikipedia.org/wiki/First_law_of_thermodynamics
    First law of thermodynamics, thermodynamic relation stating that, within an isolated system, the total energy of the system is constant, even if energy has been converted from one form to another. This law is another way of stating the law of conservation of energy.
    www.britannica.com/science/first-law-of-thermodyn…
    The first law asserts that if heat is recognized as a form of energy, then the total energy of a system plus its surroundings is conserved; in other words, the total energy of the universe remains constant. The first law is put into action by considering the flow of energy across the boundary separating a system from its surroundings.
    www.britannica.com/science/thermodynamics/The …
    The first law of thermodynamics states that the change in internal energy of a system Δ U equals the net heat transfer into the system Q, plus the net work done on the system W. In equation form, the first law of thermodynamics is, Δ U = Q + W
    www.khanacademy.org/science/physics/thermodyn…
     
  3. People also ask
    What is the first law of thermodynamics?The first law of thermodynamics is an expression of the conservation of energy principle. Energy can cross the boundaries of a closed system in the form of heat or work. Energy transfer across a system boundary due solely to the temperature difference between a system and its surroundings is called heat.
    What was the first law of thermodynamics for closed systems?The first law of thermodynamics for closed systems was originally induced from empirically observed evidence, including calorimetric evidence. It is nowadays, however, taken to provide the definition of heat via the law of conservation of energy and the definition of work in terms of changes in the external parameters of a system.
    How do you calculate the first law of thermodynamics?Note: some textbooks (see chemistry or engineering) prefer the opposite signs convention for the work, resulting in the first law of thermodynamics written as dU = dQ + dW. A system absorbs 40 J of heat and releases in the surrounding 25 J of heat. It also does 10 J of work and a work of 4 j is done on the system.
    What is the second law of thermodynamics?The second law of thermodynamics asserts that we only observe the systems moving from bottom to top, rather than from top to bottom. systems at nonzero temperature, since the increase in entropy always leads to some energy being released as heat, Eq.(3) is always an inequality and only an equality when the entropy of a system is zero.
     
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