convection vs transposition

convection

noun
  • The vertical movement of heat and moisture, especially by updrafts and downdrafts in an unstable air mass. The terms convection and thunderstorm are often used interchangeably, although thunderstorms are only one form of convection. Towering cumulus clouds are visible forms of convection. 

  • The transmission of heat in a fluid by the circulation of currents. 

transposition

verb
  • To transpose 

  • To take on the role of another person 

noun
  • A incorporation of the provisions of a European Union directive into a Member State's domestic law. 

  • A sequence of moves resulting in a position that may also be reached by another, more common sequence. 

  • A shift of a piece of music to a different musical key by adjusting all the notes of the work equally either up or down in pitch. 

  • The act or process of transposing or interchanging. 

How often have the words convection and transposition occurred in a corpus of books? (source: Google Ngram Viewer )