How do I measure the volume of a liquid? Finding the volume of a liquid is easy, for all you need to do is pour the liquid into a graduated cylinder and that's its volume.  The reading below is at 35 ml. The cylinder is graduated into mililiters. When a liquid is put into a cylinder, it does something unusual. It curves. This curve is caused by a quality that liquids called surface tension. When you read the graduated cylinder, you read it at the bottom of the curve. This is called the meniscus. 
 
 

 
 
 
 How can I find the volume of a cuboid (a regular solid object)? To find the volume of a regular solid object you measure length, then width, then height. A regular solid is an object with measurable sides such as a cube. An irregular solid is a solid without measurable sides such as a rock.
 
 

What about the volume of an irregular solid?

To find the volume of an irregular object you need more than just one tool. You need a graduated cylinder, an overflow can, and some water.

Fill the overflow can with water to the brim and let all the excess water drip out (the water above the nozzle.) Now place the cylinder under the overflow can's nozzle and slowly drop the object into the water. Now read the measurement on the cylinder to find the amount of water that dripped out of the overflow can. That is equal to the object's volume because 1 cubic centimeter =1 milliliter.