Standard Temperature and Pressure (STP)

Standard Temperature and Pressure (STP) is commonly used in physics, whereas in chemistry $25\text{celsius}$ is used. $T=273.15\mathrm{K}=0\text{celsius}$ $P=1\mathrm{atm}=1.013\cdot 10^5\mathrm{N}\cdot {\mathrm{m}}^{-2}=101.3\mathrm{kPa}$