Question

The first law of thermodynamics for isothermal process is ______.

Options

• q = - W

• ΔU = W

• ΔU = q_v

• ΔU = q_y

Answer 1

The first law of thermodynamics for isothermal process is q = - W.

Explanation:

According to first law of thermodynamics,

ΔU = q + W

where, ΔU = Internal energy

q = Heat; w = Work done

For isothermal process, ΔT = 0, ΔU = 0

∴ q = - W