NTP means
It is a term used in the scientific arena.
normal temperature and pressure:
NTP in use
standard conditions of 0°C temperature and 101.325 kPa (760 mmHg) pressure Also: STP (Standard Temperature and Pressure)
Conclusion
NTP is an acronym used in the science field, to register the normal temperature or pressure of the thing being used, or to judge your answer against the normal standard in order to regulate and document any differences incurred in the experiment, work etc.