Theory:

A volume is the amount of space occupied by any three dimensional object.
Volume=Basearea×Height
 
Unit of volume \(=\) metre \(×\) metre \(×\) metre  \(=\) cubic metre or \(m^3\).
  
Volume of regularly shaped figures can be calculated using the relevant formulae.
 
Some of the volume of regularly shaped figure are showned below.
 
volum.PNG
Volume of irregularly shaped objects are measured using the law of Archimedes.
For such cases, their volume can be determined using a measuring cylinder and water.
A volume of a liquid is equal to the volume of space it fills in the container.
Example:
Fill the water in a measuring container and it is used to measure the water in mililitre or liter.
beaker-37673.png
  
Where \(1L\)\(1000\) \(cubic\) \(centimetre\) or \(cm^3\).
Reference:
Image credit:
Measuring jar :
mage by Clker-Free-Vector-Images from Pixabay, https://pixabay.com/vectors/beaker-chemistry-liquid-blue-37673/