Winnowing

This method is used to separate a solid-solid mixture by using the wind or fast moving air. The mixture is made up of light weight solid and a heavier one. Example; maize and chaff or saw dust and nails.

How to perform winnowing

• Gather a maize containing chaff in a basin.

• Throw the mixture into the air when the wind is blowing.

• Continue the process till the chaff is blown away.

Observation

The wind blew the chaff away whilst the maize fell back into the basin.