A. Exchange of heat with colder stream B. Adiabatic expansion through a throttle valve (joule-thomson expansion) C. Merely compressing it beyond critical pressure D. Adiabatic expansion against a piston or in a turbine
A. Facilitates its use even in hard water (by sequestering the water-hardening ca & mg ions) B. Inhibits its corrosive effects C. Does not allow redeposition of dirt on the cleaned surface D. None of these
