ZIMSEC O Level Combined Science Notes: Comparing the air content of soils
Materials: small tin cans, measuring cylinders, water, samples of clay, sandy and loam soils, hammer, nail
- Fill an empty tin can with water and pour this into a measuring cylinder
- Record the volume and call it volume A
- Punch holes into the bottom of the can and push the can into the soil, open end fist, until the bottom of the can is level with the ground
- Dig away the surrounding soil and carefully remote the tin can with its soil intact
- Pour the soil into the measuring cylinder and allow the air bubbles to escape. Record the volume and call this volume B
- The volume of air is the soil is calculated using the formula:
- The percentage is calculated using the formula:
- Sandy soils have more air volume than clay and loamy soils
- Clay soils have the least amount of air content
To access more topics go to the Combined Science Notes page.
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