state first law of thermodynamics.give its mathematical expression. name the physical quantity defined by first law of thermodynamics.
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Answered by
43
Total energy of a closed system is constant. Energy can neither be created nor destroyed. It can be transformed from one form to another.
heat supplied to a system by the environment
= increase in internal energy + work done by the system on the environment
ΔQ = ΔU + W
heat supplied to a system by the environment
= increase in internal energy + work done by the system on the environment
ΔQ = ΔU + W
duragpalsingh:
nice
can u say why my ans is wrong
it was copied from my notes
which is prepared by me in computer
@sunnygopid, actually that law of thermodynamics is same in any book or site. You copy/pasted from wikipedia. that is not allowed. One is expected to write on one's own... type by oneself.. not copy-pasting.
one is expected to put in some effort to learn and collaborate with others..
ok
but i gave explanation formit not the ans sir
actually i ans the question by my own after i edited the ans as koushiknegi933 asked explanation
sir can u accept my request as friend and see you message box
Answered by
18
According to the first law of thermodynamics, during any transformation, there is conservation of energy.
In the case of closed thermodynamic systems, it is stated as follows:
"During any transformation of a closed system, the variation of its energy is equal to the quantity of energy exchanged with the external environment, by thermal transfer (heat) and mechanical transfer (labor). "
ΔQ = ΔU + W
Q = Heat supplied to system
U = Increase in internal energy
W = Work done by system
The variation of the energy of a system which undergoes a transformation can be expressed according to the following relation:
ΔE = ΔU + ΔEc + ΔEp = W + Q
ΔE = the sum of the different energy variations of the system.
ΔU = increase in internal energy
ΔEc = the variation of the macroscopic kinetic energy of the system
ΔEp = the variation of the potential energy of the system
ΔW = Work done by system
ΔQ = Heat supplied to a system
In the case of closed thermodynamic systems, it is stated as follows:
"During any transformation of a closed system, the variation of its energy is equal to the quantity of energy exchanged with the external environment, by thermal transfer (heat) and mechanical transfer (labor). "
ΔQ = ΔU + W
Q = Heat supplied to system
U = Increase in internal energy
W = Work done by system
The variation of the energy of a system which undergoes a transformation can be expressed according to the following relation:
ΔE = ΔU + ΔEc + ΔEp = W + Q
ΔE = the sum of the different energy variations of the system.
ΔU = increase in internal energy
ΔEc = the variation of the macroscopic kinetic energy of the system
ΔEp = the variation of the potential energy of the system
ΔW = Work done by system
ΔQ = Heat supplied to a system
Hope it helps!
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