instruction:
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
question:
The volume of mercury in the tube is much less than the volume in the bulb .
answer:
It consists of a bulb containing mercury attached to a glass tube of narrow diameter ; the volume of mercury in the tube is much less than the volume in the bulb .


question:
However , the plot of the movie is mostly original work adapted from a screenplay " Hardwired " by Jeff Vintar completely unlinked to Asimov 's stories , and has been compared to Asimov 's The Caves of Steel , which revolves around the murder of a roboticist .
answer:
However , the plot of the movie is mostly original work adapted from the screenplay " Hardwired " by Jeff Vintar , completely unlinked to Asimov 's stories and has been compared to Asimov 's " The Caves of Steel " , which revolves around the murder of a roboticist ( although the rest of the film 's plot is not based on that novel or other works by Asimov ) .


question:
So , a fuel is more efficient if the specific impulse is higher .
answer:

The higher the specific impulse , the less propellant is needed to produce a given thrust for a given time and the more efficient the propellant is .