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what is the difference between STP and NTP

Posted by Meenu Bhargava 6 years, 4 months ago

CBSE > Class 11 > Chemistry

5 answers

Anjali Kumari??? 6 years, 4 months ago

Harsh mishra u are from DAV?

Robinpreet Kaur 6 years, 4 months ago

Hi pratik

Pranav Punari 6 years, 4 months ago

STP is Standard Temperature and Pressure, where temperature is taken as 273K(0 C) and pressure is taken as 1 atm(1 atmosphere). Whereas NTP is Normal Temperature and Pressure, where temperature is taken as the normal room temperature(about 28-30 C) and pressure is taken as 1 atm.

Robinpreet Kaur 6 years, 4 months ago

Wow what a great answer these r the toppers HARSH MISHRA

Harsh Mishra 6 years, 4 months ago

STP stands for Standard Temperature and Pressure.
NTP stands for Normal Temperature and Pressure.

STP is set by the IUPAC as 0°C and 100 kPa or 1 bar.

Many old books and online sources say that standard pressure is 101.325 kPa (the old IUPAC standard that was changed in 1982), but It defer to the current IUPAC standard of 100 kPa.

NTP is set at 101.325 kPa but uses 20°C as the temperature.

Note:
0°C = 273.15K
20°C = 293.15K

At STP: Pressure = 1 bar = 0.987 atm
Temperature = 273 K or 0°C

At NTP: Pressure = 1 atm
Temperature = 293 K or 20°C

Also,
1 atm = 1.013 bar
1 atm = 76.0 cm
1 atm = 0.760 m

Here,
cm = centimetre
m = metre
atm = atmosphere

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