Answer Posted / azmi.2004
First Law of Thermodynamics
The first law of thermodynamics is the application of the
conservation of energy principle to heat and thermodynamic
processes:
The first law makes use of the key concepts of internal
energy, heat, and system work. It is used extensively in the
discussion of heat engines. The standard unit for all these
quantities would be the joule, although they are sometimes
expressed in calories or BTU.
It is typical for chemistry texts to write the first law as
ΔU=Q+W. It is the same law, of course - the thermodynamic
expression of the conservation of energy principle. It is
just that W is defined as the work done on the system
instead of work done by the system. In the context of
physics, the common scenario is one of adding heat to a
volume of gas and using the expansion of that gas to do
work, as in the pushing down of a piston in an internal
combustion engine. In the context of chemical reactions and
process, it may be more common to deal with situations where
work is done on the system rather than by it.
Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
What is the flow of steam in an impulse turbine?
What is the world is hardest metal?
Give one example of metal classified as per structure as bcc, fcc, hcp and ccp.
what is the difference between anf & centrifuge?
Explain bearing
plz sent me jindal placement papers in mechanical enginnering
what are the groups of instruments?
Which element is added in steel to increase resistance to corrosion ?
Identify or enumerate the parts of stern tube
Explain the types of elasticity?
What do you mean by A.CC.?
What will be expected the cut-off of J.E Mechanical exam of RRB on 19/12/2010 ?
Explain how is natural gas better than lpg?
Why gas containers are mostly cylindrical in shape?
What is the purpose of increasing the pressure on the F.O. system of the engine?