Q. Explain how volume of of liquid, regular solid and irregular solid are measured by measuring cylinder.

 Measuring the Volume

            Most of solid geometrical shapes have formulae for their volume which is obtained through different parameters such as radius, height, depth, width, base and length, but for irregular objects, liquids and gases this approach is unusual. The volume of liquids can be measured with the help of Cylinders, and Beakers.

 Measuring Cylinder

            Measuring cylinder is a glass or plastic cylinder with a scale-graduated in cubic centimeters or milliliters (ml) It is used to find the volume of liquids. When a liquid is poured, it rises to a certain height in the cylinder. The level of liquid in the cylinder  is noted and volume of the liquid is obtained. In order to read the volume correctly we should keep the eye in level with the bottom of the meniscus of the liquid surface as you learned in previous grade.

 

1. Volume of Liquid

A volume of about a liter or so can be measured using a measuring cylinder. When the liquid is poured into the cylinder the level on scale gives the volume. Most measuring cylinders have scales marked in milliliters (ml) or cubic centimeters (cm ).

 

2. Regular solid

If an object has a regular shape its volume can be calculated

For instance:

            1. Volume of a rectangular block = length x width x height

            2. Volume of a cylinder = π x radius² xheight

 

3. Irregular solid

            For an irregular solid its volume is calculated by lowering the object in a partially filled measuring cylinder. The rise in the level on the volume scale gives the volume of that object. Thus the volume of irregular solid is calculated by subtracting the original volume of liquid from the raised volume of liquid.The total volume is found. The volume of the solid is measured in a separate experiment and then subtracted from the total volume.