The first law is very simple but also very powerful. The
recognition that energy is conserved, that it is neither created nor
destroyed, allows the basic principles of arithmetic to be applied to
the flow of energy through a system. The amount of energy at the end of
a sequence of events must equal the amount at the beginning. The sums
must be equal. If they aren't, an error has been made in the analysis.
While the first law deals with quantity, the second law describes the changing quality
of energy as it moves through a system. Unlike quantity, the quality
of energy tends to change, but only in a certain direction. The second
law defines the nature of the change (although it doesn't specify how
fast the change will occur).
the statements are true : The Law of Conservation of Mass states that matter can be changed from one form
into another, mixtures can be separated or made, and pure substances can be
decomposed, but the total amount of mass remains constant. We can state this
important law in another way. The total mass of the universe is constant within
measurable limits; whenever matter undergoes a change, the total mass of the
products of the change is, within measurable limits, the same as the total mass
of the reactants.
Avogadro law states that, "equal volumes of all gases, at the same
temperature and pressure, have the same number of molecules".
May 4th, 2015
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