1. why is water displacement an effective way of measuring the volume of an irregular solid?

Water displacement - An effective way of measuring the volume of an irregular solid.

Explanation:

The water displacement method is the most effective method to measure the volume in case of an irregular shaped solid. Because, the irregular indefinite shape of the solid displaces a definite amount of water. This could be measured easily.

The irregular solid has no proper shape and so they are called as such. When the irregular solid is placed in water inside any container, it displaces a certain volume of water which is equal to the volumes of the irregular solid. Therefore, through this method, volume can easily be measured.