flow rate

• 单位时间内通过某一点或某一截面的流体（液体或气体）的体积或质量，常用单位有升每秒、立方米每小时等；也可泛指物质或信息的流动速率。

The volume or mass of a fluid, gas, or substance that passes through a given point or surface per unit of time, often measured in liters per second or cubic meters per hour.

1. Volume per unit timeB2formal

   The volume of fluid that passes through a given surface per unit of time.

   流量

   • The flow rate of the river increased after the heavy rain.
   • Engineers measured the flow rate of water through the pipe.
   • The pump's flow rate is 50 liters per minute.

2. Mass per unit timeC1formal

   The mass of a substance that passes through a given surface per unit of time.

   质量流量

   • The mass flow rate of the gas was calculated using the density.
   • The flow rate of the chemical solution is critical for the reaction.
   • They monitored the flow rate of the coolant in the system.