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The laws of thermodynamics are a set of scientific laws which define a group of physical quantities, such as temperature, energy, and entropy, that characterize thermodynamic systems in thermodynamic equilibrium. The laws also use various parameters for thermodynamic processes, such as thermodynamic work and heat, and establish relationships ...
- First Law of Thermodynamics
The first law of thermodynamics is a formulation of the law...
- Third Law of Thermodynamics
The third law of thermodynamics states that the entropy of a...
- Second Law of Thermodynamics
The second law of thermodynamics is a physical law based on...
- Zeroth Law of Thermodynamics
The zeroth law of thermodynamics is one of the four...
- Perpetual Motion
Robert Fludd's 1618 "water screw" perpetual motion machine...
- Ginsberg's Theorem
The "theorem" is given as a restatement of the consequences...
- First Law of Thermodynamics
The first law of thermodynamics states that if a system gains/loses some amount of energy, the surroundings must lose/gain the same amount of energy. The second law of thermodynamics states that entropy does not spontaneously decrease. Entropy is a measure of how spread out energy is.
- 12 min
- Mahesh Shenoy
learning objectives. Explain how the net heat transferred and net work done in a system relate to the first law of thermodynamics. The first law of thermodynamics is a version of the law of conservation of energy specialized for thermodynamic systems.
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What is the first law of thermodynamics?
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If the piston moves up, that's negative value of the work done on the gas. You'd have to plug in a negative value for the work here. So, be very careful. This is a way to calculate the internal energy. It's the first law of thermodynamics and one of the most fundamental, and most often used equations in all of thermodynamics.
- 11 min
- David SantoPietro
- "Adiabatic", "isothermal", and "isochoric" refer to different processes involving manipulation of enclosed ideal gases. An adiabatic process refers...
- U is always positive, because it's not possible to have less-than-zero-energy. Delta U (change in U) however can be positive, negative, or zero, as...
- The Zeroth Law actually states that if object 1 is in thermal equilibrium with objects 2 and 3, then 2 and 3 are also in thermal equilibrium
- Q came from the calorist's theories of heat being a quality of matter. Q means quantity. Even though the theory of heat was disproven, the term "ca...
- Q is the heat of the system so therefore it depends on the system only and this law is made for the internal energy of the system (not surroundings...
First Law of Thermodynamics-Internal Energy . Second Law of Thermodynamics-Entropy . Licenses and Attributions
Physics is the study of the natural world at its foundation. As such it is the basis of other disciplines such as biology, medicine, chemistry, computer science, geology, astronomy, and engineering. Physicists study the world from the smallest particles of matter (quarks and leptons), nuclei, atoms, and molecules; through the forces of motion ...
