The gas molar volume model is an experimental/teaching tool used to quickly calculate, demonstrate, and validate the molar volume (V ₘ) of gases at specified temperatures and pressures. It is based on the ideal gas state equation (PV=nRT) and can output a standard molar volume of 22.4 L · mol ⁻¹ at 0 ° C and 1 atm (STP) with one click. It can also set any operating condition within the range of 0-100 ° C and 0.5-2.0 atm, and provide accurate volume values in real time with an error of less than 0.5%. Application scenarios: High school/university chemistry and physics laboratory courses: verifying the ideal gas law and Avogadro hypothesis. Chemical process design: Quickly estimate the gas volume flow rate under different operating conditions. Quality inspection and measurement: calibrate gas flow meters, calibrate online analyzers.