Question

for a thermodynamic process if ∆W represents the workdone by the system and ∆U represents the increase in internal energy which one of the following is correct. a.∆U=+∆W in an isothermal process. b.∆U=-∆W in an adiabatic process. c.∆U=-∆W in an isothermal process d.∆U=+∆W in an adiabatic process​

Answer 1

An isothermal process is a constant temperature process. In this process, T= constant or ΔT=0

∴ ΔU=nCv∆T

An adiabatic process is defined as one with no heat transfer into or out of a system. Therefore, Q=0.

From the first law of thermodynamics.

W=−ΔU

or ΔU=−W