Final answer:
STP refers to the conditions of temperature and pressure used as reference in chemistry, specifically 0°C (273.15 K) and 1 atm pressure, where one mole of gas occupies 22.4 liters.
Step-by-step explanation:
Standard conditions of temperature and pressure (STP) refer to the specific conditions used as a reference point in chemistry to measure and compare the properties of gases. The correct conditions for STP are a temperature of 0°C (which is equivalent to 273.15 K) and a pressure of 1 atm (which is roughly equal to 101.325 kPa). At these conditions, one mole of an ideal gas occupies a volume of about 22.4 liters, a figure known as the standard molar volume.