`T(K) = T(°C) + 273.15`

`PV = nRT` where `n` represents the number of moles and `R` is the universal gas constant

`R = 8.314\ J//(mol•K)` `=0.0821\ (L•atm)//(mol•K)` `=1.99\ calo ries//(mol•K)`

STP: Standard Temperature and Pressure. which mean: `T = 273 K or 0°C` `P = 1.00 atm = 1.013 times 10^5\ N//m^2`

Almost `1\ mol` of any gas has a volume of `22.4\ L (22.4 times 10^(-3)\ m^3)` at STP

`N_A = 6.02 times 10^23 ` molecules/mole `PV = nRT = N/N_ART`

`PV = NkT` `k= 1.38 times 10^(-23)\ J//K`