Encyclopedia > 1740s

  Article Content

1740s



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Thunder

... of sound in air is approximately 340 m/s so the lightning is approximately one kilometer distant for every 3 second interval (one mile for 5 seconds). Areas with much ...