You are watching: Reduce by a factor of 2
Speaking as an engineer, ns would interpret "reduce ... By a aspect of ten" as meaning "reduce to one tenth of its original value". The brand-new value would certainly be 10% the the old one, which would be a 90% reduction.
Saying "reduce by 90%" sounds more precise and also has less emotional impact. "Factor of ten" doesn"t have to mean precisely 10.0.
You"ll periodically hear "order that magnitude" used instead of "factor of ten". Technically, they mean almost the exact same thing, yet in casual speech "order
EDIT: A many of human being seem to be getting this wrong, so ns will carry out some examples. First, from the Wikipedia post on order of magnitude:
An order-of-magnitude difference between two values is a factor of 10. Because that example, the massive of the earth Saturn is 95 times the of Earth, for this reason Saturn is two order of magnitude more massive 보다 Earth. Order-of-magnitude differences are called years when measured on a logarithmic scale.
...a typically used dominion of ignorance for sound loudness suggests that one offending sound must be lessened by a factor of ten in intensity come be reduced to fifty percent as loud.
Here"s a an ext extreme instance from a page about gravitational tide detection:
In all, noise is lessened by a factor of ten billion.
Obviously this doesn"t average that the noise was decreased by 0.00000001%, due to the fact that that would certainly be a ridiculously tiny difference.
From a web page on chemistry:
Serial dilutions involve diluting a stock or standard equipment multiple time in a row. Typically, the dilution aspect remains consistent for every dilution, leading to an exponential decrease in concentration. For example, a ten-fold serial dilution could result in the following concentrations: 1 M, 0.1 M, 0.01 M, 0.001 M, and so on. As is evidenced in this example, the concentration is reduced by a element of ten in each step.
From a page on software application for data backup:
At its worst, we took more than 72 hours because that a full backup ... V the Quantum solution, a full backup of our occupational is now completed in eight come ten hours. The moment needed has been reduced by a factor of ten.
From a document on trash palliation at take-out restaurants:
At Homeplate, the trash has actually been reduced through a variable of ten, definition the normal fifty pounds of trash comes from the venue indigenous each enjoy the meal (lunch, dinner) has decreased to a mere five pounds of trash and five pounds that composting.
See more: How Many Valence Electrons Are In Antimony (Sb), What Are The Valence Electrons For Sb
I uncovered these by Googling "reduced by a aspect of ten" and also looking for files that mentioned details numbers. In no case did I discover anything to suggest that to reduce by a aspect of ten way a 10% reduction. I have never heard together a usage and also will be an extremely surprised if I ever before do.