Find gas volume from the ideal gas law V = n·R·T / P.
根据理想气体状态方程 PV = nRT 计算在给定压强、温度、物质的量下的气体体积。
| Quantity | Value | Unit | Source |
|---|---|---|---|
| Gas constant R (SI) | 8.314462618 | J/(mol·K) | CODATA 2018 |
| Gas constant R (L·atm) | 0.082057 | L·atm/(mol·K) | common engineering value |
| Molar volume (STP 100 kPa) | 22.711 | L/mol | IUPAC 1982 / ISO 2533 |
| Molar volume (old STP 101.325 kPa) | 22.414 | L/mol | legacy def. (common in textbooks) |
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Volume of an ideal gas | V = n · R · T / P | Clapeyron E. (1834), Memoire sur la puissance motrice de la chaleur |
| Molar volume at STP | About 22.414 L/mol at 0 °C and 101.325 kPa | IUPAC, Quantities, Units and Symbols in Physical Chemistry (Green Book) |
| Avogadro constant | N_A = 6.02214076 × 10^23 mol^-1, fixed by the 2019 SI definition | BIPM, The International System of Units (SI Brochure, 9th ed., 2019) |
| Range of validity | Holds approximately at low pressure and high temperature; corrections are needed near liquefaction | Atkins PW, de Paula J, Physical Chemistry |