Define STP and NTP

In the STP system, both pressure and temperature are in their typical form. Pressure and temperature of this system are considered as 760 torr and 273K correspondingly. Standard temperature is described as zero degrees Celsius (0 0C), which transposes to 32 degrees Fahrenheit (32 0F) or 273.15 degrees kelvin (273.15 0K). This is essentially the freezing point of pure water at sea level, in air at standard pressure.

Normal Temperature and Pressure is defined as air at 20oC (293.15 K, 68oF) and 1 atm. NTP is 20°C temperature and 1 atm pressure generally.

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