Most of the gases exhibit drop in temperature upon expansion. However, this may not be true in case of | Mechanical Engineering Objective
A. Carbon dioxide
B. Oxygen
C. Hydrogen
D. Helium
Answer:C
Most of the gases exhibit drop in temperature upon expansion. However, this may not be true in case of | Mechanical Engineering Objective
A. Carbon dioxide B. Oxygen C. Hydrogen D. Helium
Explanation: In thermodynamics, the Joule – Thompson (Also known as the Joule – Kelvin effect or Kelvin – Joule effect) describes the temperature change of real gas or liquid when it is forced through a value or porous plug while keeping it insulated so that no heat is exchanged with the environment. This procedure is called as throttling process or Joule – Thompson process. At room temperature, all gases except hydrogen, helium, and neon cool upon expansion by the Joule – Thompson process when being throttled through an orifice, there three gases experience the same effect but only at lower temperature.