STP

[Jared Khoo 1G]

Why is STP at 273.15 K (0 Celcius) and not 298 K like many constants are given at. Is there a separate constants list for values at STP?

[KaleenaJezycki_1I]

STP is 25 degrees Celsius that's why its 298K. At 0 degree celsius its 273.15K because to go from celsius to kelvin you add 273.15

[Bryan Chen 1H]

i think 298 is 25+273 and 25 is considered "room temperature" not "standard"

[vanessas0123]

You should check the constants list and if it explicitly states that it's at STP and not 298K!

[Nathan Nakaguchi 1G]

STP is 0 Celsius, 273.15K and 1.00 atm. The equations should work the same except for when your dealing with things like where typically those constants are calculated from 298 K. Its probably best to make sure the constants you're dealing with explicitly say it was calculated from STP or 298K.

[Max Madrzyk Dis 4G]

298 K is 25 C which is room temperature and not standard temperature.

[Abhi Vempati 2H]

STP, which is standard temperature and pressure, is 1 atm and 273 K (273.15, to be specific).

This is often confused with standard state/standard conditions, which is 298 K, This is also referred to as room temperature.

Hope this helps!

[kendal mccarthy]

STP is just 273.15K and 1 atm. These values are mainly just for theoretical calculations because 0K is not feasible in everyday life.

[Victor Qiu 1C]

I think the values are:
Standard Temperature and Pressure (STP): 101.325kPa (1atm), 0°C (273.15K);
Standard Ambient Temperature and Pressure (STP): 101.325kPa (1atm), 25°C (298.15K).

[Ephrem Gerald 2A]

STP is specifically at 273.15K and 1.00atm and although most constants are calculated at room temperature, it is probably done so for practicality sake, but STP can come in handy when dealing with ideal gases as well. There is the constant of 22.4L/mol that is calculated at STP and it says that 1 mole of an ideal gas at STP will occupy 22.4L of space. There are certainly other uses for STP as well, that is just one example.

[Kathy_Li_1H]

Hi! STP is at 273K, whereas room temperature (what you're thinking about) is 298K.

[Brandon Gruender 3F]

STP is 0 degrees Celsius, which is 273 K. Normally we see 298 K because that is 25 degrees Celsius, or around room temp.

[Ryan Agcaoili 2E]

STP, which is standard temperature and pressure, is 273.15K and 1 atm. Room temperature is 298K.