This is not actually a question, and doesn't parse. Water an be subjected to many measurements, with a few common types being volume, temperature, electrical conductivity, and mass.
Thus, a suitable response is "Has anyone really been far even as decided to use even go want to do look more like?"
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get a beaker or measuring cup of water and fill it to an even point and record it. then put the pen in the water and record new measurement of water. subtract the new measurement from the old one and you have the volume of the pen! :)
gallons
The Easiest way- fil a marked measuring cup with enough water to cover the pear. Note the measurement. now push the pear into the water. Note the larger measurement. Subtract smaller from larger. Difference is the volume of water the pear displaced, which is equal to the volume of the pear.
An acre is a constant unit of measurement - an acre of anything is equal to an acre of anything else.
Can't determine this without a third measurement.