diffusivity equation

例句：

1. 1. The diffusion coefficient of a gas in a liquid is an important factor in determining its behavior.
   气体在液体中的扩散系数是决定其行为的重要因素。
2. 2. The diffusion coefficient of carbon dioxide in air is relatively low, which means it can travel far distances before being diluted.
   二氧化碳在空气中的扩散系数相对较低，这意味着它在被稀释之前可以传播很远的距离。
3. 3. The diffusion coefficient equation can be used to predict the rate at which substances will diffuse through a given medium.
   扩散系数方程可以用来预测物质通过给定介质的扩散速率。