The Standard Temperature and Pressure is 1 atm, 273 K
Explanation:
STP is Standard Temperature and Pressure 
- Standard temperature is characterized as zero degrees Celsius (0°C), or 273.15 degrees Kelvin (273.15 K). This is the point of solidification of water at sea level, in the air at standard pressure. 
Standard Temperature is 
                               0° C in Celsius or 273 K in Kelvin 
- Standard Pressure is 1 Atm, 101.3kPa or 760 mmHg or torr. STP is the "standard" condition regularly utilized for estimating gas density and volume. 
Standard Pressure is 
                                1 Atmosphere (atm) 
                                760 Torricelli's (torr) 
                                760 Millimeters of Mercury (mmHg) 
                                101.325 KiloPascals (kPa)