S.T.P. is standard temperature and pressure. Measured at 0 degrees Celsius and 1 atm pressure. One mole of gas occupies 22.4 dm^3 at S.T.P.
R.T.P. is room/real temperature and pressure. Measured at 25 degrees Celsius and 1 atm pressure. One mole of gas occupies 24 dm^3 at R.T.P.
R.T.P. is room/real temperature and pressure. Measured at 25 degrees Celsius and 1 atm pressure. One mole of gas occupies 24 dm^3 at R.T.P.
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STP is standard temperature and pressure. RTP i believe is real temperature and pressure