Originally posted by SS Junk
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PV/T = constant and this relating the variables P. V and T of an ideal gas is known as the equation of state. The product ‘PV’ over T is always constant for all specified states of the gas. Hence, if we know these values for any one state the constant can be calculated. In standard state or STP, with the pressure at 1 atm and temperature at being 273.16 K, the volume occupied by a mole of an ideal gas would be equal to 22.414 L. According to Avogadro’s law this volume is same for all ideal gases and if we consider ‘n’ moles of an ideal gas at STP, then the equation becomes
PV/T = PoVo/To = nR
PV = nRT, Where, R is a universal gas constant per mole. The above equation is known as the ideal gas equation and it connects directly all the components and permits all kinds of calculations.
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