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R is a constant and I believe it will be given to us for tests (???). T represents temperature in Kelvin. In order for us to use the ideal gas law to convert between pressures and concentrations, we will usually be given the temperature in the problem. It may also be handy to remember the conversion between Celsius and Kelvin just in case we are given the temperature in degrees Celsius.
R is the gas constant, which will most likely be given to us. T is the temperature, which will usually be given to us in either Celsius or Kelvin. If it is in Celsius, we will need to convert it to Kelvin by adding approximately 273 to the temperature in Celsius.