Why Does the Value of the Universal Gas Constant Change?

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The discussion centers on the universal gas constant "R," which can be expressed in different units depending on the context. The two common values mentioned are 0.0821 L*atm/(mol*K) and 8.314 J/(mol*K). The confusion arises from the need to convert units, as 1 L equals 0.001 m³ and 1 atm equals 101,325 Pa. This conversion illustrates that the value of R changes based on the units used, similar to how speed can be represented in different measurement systems, such as miles per hour versus kilometers per hour. The importance of understanding these unit conversions is emphasized for clarity in gas law calculations. For further reference, a table of the ideal gas constant in various units is available on Wikipedia.
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Clarification on "R" constant?

I'm pretty confused right now. The R constant, or universal gas constant has been troubling me. In one problem it is defined as .0821 L*atm/m*K. But soon after that it becomes 8.314 J/mol*K. Can somebody explain this concept to me? Thank you.
 
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J is defined in terms of m3 and Pa. So convert L -> m3 and atm -> Pascals to get the new value of R.
 

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