to distinguish between ideal gas and real, you need to know temperature and pressure, becuase each time you read about the difference between them…

to distinguish between ideal gas and real, you need to know temperature and pressure, becuase each time you read about the difference between them you will see high pressure, low temperatute. So my question, at temperature “F” and pressure “psig” i can conclude this is ideal or real. In other words, at what conditions “pressure, and temperature” the gas is considered to be ideal.