During adiabatic expansion the increase in volume is associated with

Options

A. `{:("Pressure","Temperature"),("increase","increase"):}`
B. `{:("Pressure","Temperature"),("decrease","decrease"):}`
C. `{:("Pressure","Temperature"),("increase","decrease"):}`
D. `{:("Pressure","Temperature"),("decrease","increase"):}`

Answer

B

Explanation

According to first law of thermodynamics,
`DeltaQ=DeltaU+DeltaW`
For an adiabatic process, `DeltaQ=0`
`therefore" " DeltaU=-W`
In adiabatic process, `pprop(1)/(V^(gamma))andTprop(1)/(V^(gamma-1))`
`gammagt1,` because volume increases.
Then,p and T will decrease.