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The product of the force on an object and the displacement the object undergoes along the direction of the force.

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What is the unit for work done?

J (joule) is the SI unit of $work$ which is equal to N m. It's a derived unit of work and the name is chosen in honor of James Joule who is pretty well known for his work in Thermodynamics. …
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What is the sign convention being used in thermodynamics for calculating work done?

$Q$ = Heat Supplied $W$ = Could be work done ON or BY the system. … In EXPANSION (/work done BY the system): $-W $= (Pressure)$*$($+$Change in Volume) So, $ W$ = $-$(Pressure)$*$(Change in Volume) $W= - P* \Delta V ----1.29$ Equations 1.28 & 1.29 give formula for the work
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What is the sign convention being used in thermodynamics for calculating work done?

In 1.28 he mentions that negative sign is being used because the volume is decreasing (and the work is being done on the system). … But then in 1.29 he uses the same negative signed formula for a system that is clearly expanding (and hence work is being done by the system) as that can be seen from the graph and the limits used in the …
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