11. :: : Generally superheating only occurs in liquids. 12. Superheating was applied in the 1920s, followed by piston valves shortly afterwards.13. Both have since received extensive modifications including superheating . 14. This makes subcooling an easy and widespread source of heat for the superheating process. 15. When they were subsequently converted to superheating , they were reclassified to Class 14. 16. Shunting locomotives did not generally use superheating . 17. There is also the possibility of Superheating . 18. Mills developed a way of superheating the liquid soap, then spraying it to concentrate it. 19. Another important and very common application of subcooling is its indirect use on the superheating process. 20. In 1923 the North British Railway became part of the LNER, during the superheating programme.
