It's calculated, not measured.
It's the speed of light ... 299,792,458 meters per second ...
multiplied by the number of seconds in a standard year.
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Nolume is measured in unit meter cubed, m3.
The measurement unit depends on the characteristic that is being measured.
Volume is measured in decibals.
They are measured on the Richter scale.
Degrees of angles are measured with a protractor.