Fill in the following blanks with suitable words
Percolation rate of water in soil is expressed in the unit of …………

Answer

To fill in the blank in the statement "Percolation rate of water in soil is expressed in the unit of …………", we can follow these steps:

1. **Understand the Concept of Percolation**: Percolation refers to the process by which water moves through soil. It is important to know that this rate can vary based on soil type.

2. **Identify the Measurement of Percolation Rate**: The percolation rate measures how quickly water can pass through soil. It is typically quantified in terms of volume over time.

3. **Determine the Appropriate Unit**: The common unit used to express the percolation rate of water in soil is "milliliters per minute". This unit indicates how many milliliters of water pass through a certain point in the soil in one minute.

4. **Fill in the Blank**: Based on the understanding and the unit identified, we can fill in the blank: "Percolation rate of water in soil is expressed in the unit of **milliliters per minute**."

### Final Answer:
Percolation rate of water in soil is expressed in the unit of **milliliters per minute**.