Equation of state is PV=nRT
Where P is pressure
V is volume
T is temperature
R is gas constant
decision tree is a logical sequence to use gas equztion of state
example is shown below:
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Gases  > obey 1) PV = conatat at given temperature
and fixed number of moles
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( isothermal law , Boyle's law )
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> 2) V/T = constant if P, n are constant values
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(isobaric law charles law)
    >   3) PV=RT for one mole
of gas
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(Gas equation for one mole )
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.