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What are the first and second Laws of Thermodynamics?
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Quiz Taker, Honors
The first law of thermodynamics is the law of consrvation of energy. It expresses that heat and mechanical work is both the forms of energy and the can be interconverted. But their sum is always constant.
The second law is the law which governs the flow of heat and its conversion to mechanical work. It has many statements. It says that heat can only flow from higer temperature to lower temperature without external energy being added. It also says that entropy of a closed system cant decrease.
Posted by biditism on June 21, 2012 at 9:00 AM (Answer #1)
Posted by jerichorayel on June 21, 2012 at 6:04 AM (Answer #2)
Valedictorian, Super Tutor, Tutor, Dean's List
1st law: Energy can neither be created nor destroyed but can be
transferred from one form to another; total heat and energy
2nd law: heat always flows naturally from a hot object to a cold object
but never from a cold object to a hot object.
Posted by elekzy on June 21, 2012 at 11:22 PM (Answer #3)
First Law ....(conservation of energy)
Energy can neither be created neither destroyed but can be transformed from one form to another form, the toatal energy in the universe remain constant
Example - work done by the mechanical force...
Second law of thermodynamics..
Explain you about the direction of heat transfer...
it is impossible to extract an amount of heat from a hot reservoir and use it all to do work. Some amount of heat must be exhausted to a cold reservoir.
Posted by sanjeetmanna on June 23, 2012 at 3:07 PM (Answer #4)
High School Teacher
The first Law of Thermodynamics concerns the state of matter and energy. According to this law, there is a specific and finite amount of matter and energy in the universe, and that amount cannot be increased or decreased; instead, all matter and energy can be changed in form to one or the other, without ever losing the gross total of all matter/energy. Because of this, no system can ever put out more energy than it takes in, and no matter can ever be entirely destroyed.
The second Law of Thermodynamics concerns entropy, or the tendency for an isolated system to come to a stable state. Because the universe is a closed system, having a finite amount of matter/energy with no method of creating or destroying it, everything in the universe is moving towards a state of equilibrium, where all matter and energy are in the same physical state and the same temperature. This eventual fate is called the "Heat Death of the Universe," at which point there can be no motion because everything is in exactly the same state.
Posted by belarafon on June 28, 2012 at 6:31 PM (Answer #5)
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