With requirements of designing an adiabatic capillary tube in engineering, an approximate analytic solution to the tube length derived from the approximateintegral model is developed.
This paper gives some approximate formulas of the integral average value for experimental calculation on the basis of the integral mean law. Examples are given for explanation.
本文依据积分中值定理给出了适宜于实验计算的积分平均值的近似公式，并举例加以说明。
3
The second integral is easier to approximate than the first one.