本文叙述了:(1)压力对气室有效容积的导数与气室有效容积的平方成反比,即dP/dV=-(RT)/V~2。由此可见,气室的容积无论是理论上或实际制造中都不能认为愈大愈好,因为V→∞时,dP/dV→0,压力升不高,根本不能喷雾。(2)在某些农机教科书上引有空气室内平均液体容积V_(cp)≈1/3 V_k,又说气室的总容积(即 This paper states: (1) The derivative of effective pressure on the effective volume of the gas chamber is inversely proportional to the square of the effective volume of the gas chamber, ie dP / dV = - (RT) / V ~ 2. Thus, the volume of the gas chamber in theory or in actual manufacture can not be considered as bigger as possible, because V → ∞, dP / dV → 0, the pressure rise is not high, simply can not spray. (2) In some textbooks on agricultural machinery, the indoor average liquid volume V_ (cp) ≈1 / 3 V_k is introduced, and the total volume of the air chamber