In terms of relative length of units, a yoctometre ranks as follows: Planck length yoctometre zeptometre. A yoctometre is 1/1000 of a zeptometre (1 zeptometre (zm) = 1,000 yoctometres). The yoctometre,is the distance light travels in about:1Ã·2.99Ã10 35 seconds.
Engines of various sorts have been invented over the last two or three centuries. 1  In 1698, English military engineer, Thomas Savery, invented and patented the first crude steam engine, based on Denis Papin's Digester (pressure cooker) of 1679.
Dr. Rudolf Diesel invented the diesel engine in the year 1897. He was mechanical engineer by profession and belonged to Germany. The diesel engine is a compressedâignition engine that works with a piston which compresses air and injects oil-based fuel into the superheated air, causing spontaneous combustion of the fuel.