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Hawai'i Space Grant College, Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, 1997

 

Porosity

Purpose

To measure the amount of water stored in the pore space of a soil sample.

Key Words
  •  soil
  • particle
  • pore space
  • porosity
  • saturation
  • groundwater

Materials

  • dry soil sample or sand
  • two 500 ml beakers
  • water

Background

Soils are made of particles of different types and sizes. The space between particles is called pore space. Pore space determines the amount of water that a given volume of soil can hold. Porosity is the percentage of the total volume of soil that consists of pore space. This is an important measurement in areas where drinking water is provided by groundwater reserves.

Procedure

  1. Fill one beaker, up to the 500 ml mark, with dry soil or sand. Place it on a table or flat workspace.
  2. Fill the other beaker, up to the 500 ml mark, with water.
  3. Slowly pour the water from the second beaker into the soil sample. Stop pouring when the water level reaches the top of the soil. The soil has reached saturation and cannot hold any more water.
  4. How much water is left in the second beaker?
  5. How much water is now held in the pore spaces of the soil sample?
  6. Use your answer from question 5 to compute the porosity (the percentage of pore space) of the soil sample.


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