Difference between STP AND NTP
STP stands for standard temperature and pressure. These standards have been set by the IUPAC. For STP conditions, the temperature is 273.15K (00 C) and pressure is 1 bar (105 Pascals).
NTP is defined as normal temperature and pressure. For NTP conditions, the temperature is 293.15 K (200 C) and pressure is 1 atm pressure which is equal to 1.01325X 105 Pascals.