WebbThe internal energy of an ideal gas is given by, Δ E i n t = ( f 2) p V Here f is the degree of freedom, f is the pressure, V is the volume. Substitute n R T for p V into the above equation. Δ E i n t = ( f 2) n R T Here n is the number of moles, R … WebbRemember, gas volumes vary according to the conditions (e. temperature, air pressure and water vapour pressure). 1. V̇E Minute ventilation (V̇E; calculated from time and expired gas volume) needs to be expressed as standard pressure, temperature and dry (STPD) 273 K (0°C), 760 mmHg, dry air. This is the standard reference for comparing volumes.
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