Answer:
By placing it in water and measuring how high the water rises
Explanation:
You can place the object in a can filled with water. You'll then see that as it sits there, the water level rises. You would then measure that to find the volume.
The maximum theoretical efficiency of the system is the one corresponding to the efficiency of a Carnot cycle operating between the same temperatures of the system:

where

and

are the cold and hot temperatures, respectively.
In our problem,

and

, therefore the maximum theoretical efficiency is

So, 33%.
It shortens so that the tips reach faster