The 'ERG' is the standard unit for work or mechanical energy.
Work is the measure of force used to move an object.Force is the answer. Hope it helped.
power
WMA
No, temperature is not a measure of work, because work is the form of you doing something to an object to move it through an empty space. You are not doing anything to temperature, so therefor no, it is not work.
Efficiency
If you are given the volume, then you do not need to work it out!
You can measure distance traveled, energy used or work done.
No a volt is a measure of the "push" or potential. A watt (a volt times an amp) would be a measure of the work.
Work
measure it
Efficiency