Well, you could use a measuring cylinder. Take the reading of the volume of the liquid inside the cylinder in ml or cm^3. For example, the amount of water is 25ml. Then drop in the shape and the volume will increase. If the new volume is 75ml, then all you have to do is 75-25=50. %0ml is the volume of the irregular shape.
A graduated cylinder or a beaker can be used to measure the volume or capacity of a water bottle by pouring water from the bottle into the measuring instrument and reading the volume indicated on the scale.
Beaker
A micrometer (or micrometer screw gauge) measures the volume of a screw.
a decibel meter.
Spirometer...spirometerSpirometer
a calorimeter
volume
spirometer
you would use fat Steve
A rectangle is a 2-dimensional shape. Therefore, it has no volume - which is what capacity measures.
The instrument that measures the volume of inhaled and exhaled air is called a spirometer. It is commonly used to assess lung function and diagnose respiratory conditions.
You do the Mass of the object then, divide the Volume away from it.